We're dividing 25129386 by 21 
We want to divide 25129386 by 21.

Advancing to step 1:
21 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 21

Let's proceed to step 2:
The number 21 fits into 25 1 times, leaving a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 4 after subtracting 21 from 25.
Include the next digit (1) from the dividend after 4, then repeat: 41 / 21

Moving on to step 3:
If we divide 41 by 21, we get 1 and a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 11.0
The remainder is 20 after subtracting 21 from 41.
Take the next digit (2) from the dividend and append it to 20, then repeat: 202 / 21

Let's proceed to step 4:
The number 21 fits into 202 9 times, leaving a remainder of 13.
The next digit of our result is 9. 
Result so far: 119.0
The remainder is 13 after subtracting 189 from 202.
Grab the next digit (9) from the dividend, add it to 13, then carry on: 139 / 21

Going ahead to step 5:
139 divided by 21 is 6 with a remainder of 13.
Use 6 as the next digit of our solution. 
Result so far: 1196.0
Deduct 126 from 139 and we're left with 13.
Grab the next digit (3) from the dividend, add it to 13, then carry on: 133 / 21

Step 6:
21 can be fit into 133 6 times, resulting in a remainder of 7.
Record the quotient 6 as the next digit in the result. 
Result so far: 11966.0
The remainder is 7 after subtracting 126 from 133.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 21

Moving on to step 7:
When dividing 78 by 21, we get 3 with a remainder of 15.
Record the quotient 3 as the next digit in the result. 
Result so far: 119663.0
The remainder is 15 after subtracting 63 from 78.
Take the next digit (6) from the dividend and append it to 15, then repeat: 156 / 21

On to step 8:
If we divide 156 by 21, we get 7 and a remainder of 9.
The next digit of our result is 7. 
Result so far: 1196637.0
Subtract 147 from 156 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 9:
When dividing 90 by 21, we get 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 1196637.4
If we subtract 84 from 90, we get 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 10:
60 divided by 21 is 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 1196637.42
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 11:
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: 1196637.428
Subtracting 168 from 180 leaves us 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.

Advancing to step 12:
When dividing 120 by 21, we get 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 1196637.4285
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.

Advancing to step 13:
When dividing 150 by 21, we get 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 1196637.42857
The remainder is 3 after subtracting 147 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 14:
21 goes into 30 1 times with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 1196637.428571
The remainder is 9 after subtracting 21 from 30.
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 15:
21 goes into 90 4 times with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 1196637.4285714
If we subtract 84 from 90, we get 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 16:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 1196637.42857142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The quotient of the division is 1196637.42857142, and the remainder is 1.8e-08.