28124517 divided by 21 
We want to divide 28124517 by 21.

Let's proceed to step 1:
When dividing 2 by 21, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 21

On to step 2:
When dividing 28 by 21, we get 1 with a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 21 away from 28, we end up with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 21

Step 3:
71 divided by 21 is 3 with a remainder of 8.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we subtract 63 from 71, we get 8.
Fetch the next digit (2) from the dividend, attach it to 8 and continue: 82 / 21

Advancing to step 4:
21 goes into 82 3 times with a remainder of 19.
Use 3 as the next digit of our solution. 
Result so far: 133.0
Deduct 63 from 82 and we're left with 19.
Take the next digit (4) from the dividend and append it to 19, then repeat: 194 / 21

Let's proceed to step 5:
21 goes into 194 9 times with a remainder of 5.
The number 9 becomes the next digit in our result. 
Result so far: 1339.0
Deduct 189 from 194 and we're left with 5.
Fetch the next digit (5) from the dividend, attach it to 5 and continue: 55 / 21

Moving on to step 6:
If we divide 55 by 21, we get 2 and a remainder of 13.
Record the quotient 2 as the next digit in the result. 
Result so far: 13392.0
Deduct 42 from 55 and we're left with 13.
Grab the next digit (1) from the dividend, add it to 13, then carry on: 131 / 21

Advancing to step 7:
21 can be fit into 131 6 times, resulting in a remainder of 5.
Record the quotient 6 as the next digit in the result. 
Result so far: 133926.0
Subtracting 126 from 131 leaves us with 5.
Grab the next digit (7) from the dividend, add it to 5, then carry on: 57 / 21

Advancing to step 8:
21 goes into 57 2 times with a remainder of 15.
Put 2 as the next digit of the answer. 
Result so far: 1339262.0
Subtract 42 from 57 to get 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 9:
When dividing 150 by 21, we get 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 1339262.7
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 10:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 1339262.71
Subtract 21 from 30 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.

Going ahead to step 11:
21 goes into 90 4 times with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 1339262.714
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.

Going ahead to step 12:
If we divide 60 by 21, we get 2 and a remainder of 18.
The next digit of our result is 2. 
Result so far: 1339262.7142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 13:
21 goes into 180 8 times with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 1339262.71428
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.

Moving on to step 14:
21 can be fit into 120 5 times, resulting in a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 1339262.714285
Subtracting 105 from 120 leaves us 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.

Let's proceed to step 15:
If we divide 150 by 21, we get 7 and a remainder of 3.
The next digit of our result is 7. 
Result so far: 1339262.7142857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 16:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 1339262.71428571
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.

The final result is 1339262.71428571 with a remainder of 9e-09.