899817 divided by 21 
Let's see how many times 21 fits into 899817.

Let's proceed to step 1:
The number 21 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 21

Advancing to step 2:
21 goes into 89 4 times with a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 5 after subtracting 84 from 89.
Fetch the next digit (9) from the dividend, attach it to 5 and continue: 59 / 21

Step 3:
21 can be fit into 59 2 times, resulting in a remainder of 17.
Use 2 as the next digit of our solution. 
Result so far: 42.0
Subtracting 42 from 59 leaves us with 17.
Grab the next digit (8) from the dividend, add it to 17, then carry on: 178 / 21

On to step 4:
178 divided by 21 is 8 with a remainder of 10.
Use 8 as the next digit of our solution. 
Result so far: 428.0
Subtracting 168 from 178 leaves us with 10.
Bring next digit (1) of the dividend behind the 10 and repeat the process: 101 / 21

Moving on to step 5:
21 goes into 101 4 times with a remainder of 17.
Put 4 as the next digit of the answer. 
Result so far: 4284.0
Subtract 84 from 101 to get 17.
Grab the next digit (7) from the dividend, add it to 17, then carry on: 177 / 21

Step 6:
The number 21 fits into 177 8 times, leaving a remainder of 9.
Put 8 as the next digit of the answer. 
Result so far: 42848.0
The remainder is 9 after subtracting 168 from 177.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
If we divide 90 by 21, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 42848.4
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 8:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 42848.42
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 9:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 42848.428
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 10:
If we divide 120 by 21, we get 5 and a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 42848.4285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 11:
21 goes into 150 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 42848.42857
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 12:
When dividing 30 by 21, we get 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 42848.428571
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 13:
When dividing 90 by 21, we get 4 with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 42848.4285714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 14:
21 goes into 60 2 times with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 42848.42857142
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The final outcome is 42848.42857142, with a leftover of 1.8e-08.