We're dividing 21489278 by 402 
We want to divide 21489278 by 402.

Moving on to step 1:
2 divided by 402 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 402

Advancing to step 2:
When dividing 21 by 402, we get 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Include the next digit (4) from the dividend after 21, then repeat: 214 / 402

Going ahead to step 3:
The number 402 fits into 214 0 times, leaving a remainder of 214.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 214 to get 214.
Fetch the next digit (8) from the dividend, attach it to 214 and continue: 2148 / 402

Step 4:
402 can be fit into 2148 5 times, resulting in a remainder of 138.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Deduct 2010 from 2148 and we're left with 138.
Grab the next digit (9) from the dividend, add it to 138, then carry on: 1389 / 402

Moving on to step 5:
When dividing 1389 by 402, we get 3 with a remainder of 183.
The next digit of our result is 3. 
Result so far: 53.0
Deduct 1206 from 1389 and we're left with 183.
Append the next digit (2) from the dividend to 183 and continue with: 1832 / 402

Going ahead to step 6:
1832 divided by 402 is 4 with a remainder of 224.
Record the quotient 4 as the next digit in the result. 
Result so far: 534.0
If we subtract 1608 from 1832, we get 224.
Grab the next digit (7) from the dividend, add it to 224, then carry on: 2247 / 402

Step 7:
The number 402 fits into 2247 5 times, leaving a remainder of 237.
Put 5 as the next digit of the answer. 
Result so far: 5345.0
Subtracting 2010 from 2247 leaves us with 237.
Take the next digit (8) from the dividend and append it to 237, then repeat: 2378 / 402

Going ahead to step 8:
2378 divided by 402 is 5 with a remainder of 368.
Use 5 as the next digit of our solution. 
Result so far: 53455.0
If we take 2010 away from 2378, we end up with 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

Moving on to step 9:
402 goes into 3680 9 times with a remainder of 62.
The next digit of our result is 9. 
Result so far: 53455.9
Subtracting 3618 from 3680 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 10:
402 can be fit into 620 1 times, resulting in a remainder of 218.
The next digit of our result is 1. 
Result so far: 53455.91
If we subtract 402 from 620, we get 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

Let's proceed to step 11:
402 can be fit into 2180 5 times, resulting in a remainder of 170.
The next digit of our result is 5. 
Result so far: 53455.915
Subtract 2010 from 2180 to get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Step 12:
402 can be fit into 1700 4 times, resulting in a remainder of 92.
Write down 4 as next digit of the result. 
Result so far: 53455.9154
The remainder is 92 after subtracting 1608 from 1700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Advancing to step 13:
402 goes into 920 2 times with a remainder of 116.
The next digit of our result is 2. 
Result so far: 53455.91542
If we subtract 804 from 920, we get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Going ahead to step 14:
The number 402 fits into 1160 2 times, leaving a remainder of 356.
The next digit of our result is 2. 
Result so far: 53455.915422
The remainder is 356 after subtracting 804 from 1160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

Our division results in 53455.915422 with a remaining 3.56e-05.