21542561 ÷ 990 
Let's see how many times 990 fits into 21542561.

Let's proceed to step 1:
When dividing 2 by 990, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 990

Going ahead to step 2:
The number 990 fits into 21 0 times, leaving a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Fetch the next digit (5) from the dividend, attach it to 21 and continue: 215 / 990

Advancing to step 3:
If we divide 215 by 990, we get 0 and a remainder of 215.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 215 after subtracting 0 from 215.
Append the next digit (4) from the dividend to 215 and continue with: 2154 / 990

Moving on to step 4:
990 can be fit into 2154 2 times, resulting in a remainder of 174.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 1980 from 2154 to get 174.
Include the next digit (2) from the dividend after 174, then repeat: 1742 / 990

Moving on to step 5:
When dividing 1742 by 990, we get 1 with a remainder of 752.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Subtracting 990 from 1742 leaves us with 752.
Include the next digit (5) from the dividend after 752, then repeat: 7525 / 990

Advancing to step 6:
If we divide 7525 by 990, we get 7 and a remainder of 595.
The next digit of our result is 7. 
Result so far: 217.0
If we take 6930 away from 7525, we end up with 595.
Take the next digit (6) from the dividend and append it to 595, then repeat: 5956 / 990

Step 7:
When dividing 5956 by 990, we get 6 with a remainder of 16.
Put 6 as the next digit of the answer. 
Result so far: 2176.0
Deduct 5940 from 5956 and we're left with 16.
Append the next digit (1) from the dividend to 16 and continue with: 161 / 990

On to step 8:
If we divide 161 by 990, we get 0 and a remainder of 161.
Record the quotient 0 as the next digit in the result. 
Result so far: 21760.0
If we subtract 0 from 161, we get 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

Going ahead to step 9:
990 can be fit into 1610 1 times, resulting in a remainder of 620.
Record the quotient 1 as the next digit in the result. 
Result so far: 21760.1
If we subtract 990 from 1610, we get 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

On to step 10:
990 can be fit into 6200 6 times, resulting in a remainder of 260.
Write down 6 as next digit of the result. 
Result so far: 21760.16
Deduct 5940 from 6200 and we're left with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Advancing to step 11:
If we divide 2600 by 990, we get 2 and a remainder of 620.
Put 2 as the next digit of the answer. 
Result so far: 21760.162
Subtracting 1980 from 2600 leaves us with 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Step 12:
6200 divided by 990 is 6 with a remainder of 260.
The next digit of our result is 6. 
Result so far: 21760.1626
Subtracting 5940 from 6200 leaves us with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Step 13:
When dividing 2600 by 990, we get 2 with a remainder of 620.
The number 2 becomes the next digit in our result. 
Result so far: 21760.16262
If we take 1980 away from 2600, we end up with 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Moving on to step 14:
The number 990 fits into 6200 6 times, leaving a remainder of 260.
Record the quotient 6 as the next digit in the result. 
Result so far: 21760.162626
The remainder is 260 after subtracting 5940 from 6200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Step 15:
990 can be fit into 2600 2 times, resulting in a remainder of 620.
Write down 2 as next digit of the result. 
Result so far: 21760.1626262
If we subtract 1980 from 2600, we get 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Advancing to step 16:
When dividing 6200 by 990, we get 6 with a remainder of 260.
Record the quotient 6 as the next digit in the result. 
Result so far: 21760.16262626
If we take 5940 away from 6200, we end up with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

The final result is 21760.16262626 with a remainder of 2.6e-07.