We divide 84915212 by 21
We're looking to find how many times 21 goes into 84915212.

On to step 1:
If we divide 8 by 21, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 21

Advancing to step 2:
21 goes into 84 4 times with a remainder of 0.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 84 from 84, we get 0.
Fetch the next digit (9) from the dividend, attach it to 0 and continue: 9 / 21

Step 3:
21 can be fit into 9 0 times, resulting in a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 40.0
Subtract 0 from 9 to get 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 21

On to step 4:
21 can be fit into 91 4 times, resulting in a remainder of 7.
Put 4 as the next digit of the answer. 
Result so far: 404.0
Subtract 84 from 91 to get 7.
Grab the next digit (5) from the dividend, add it to 7, then carry on: 75 / 21

Going ahead to step 5:
If we divide 75 by 21, we get 3 and a remainder of 12.
Record the quotient 3 as the next digit in the result. 
Result so far: 4043.0
If we take 63 away from 75, we end up with 12.
Append the next digit (2) from the dividend to 12 and continue with: 122 / 21

On to step 6:
21 goes into 122 5 times with a remainder of 17.
Put 5 as the next digit of the answer. 
Result so far: 40435.0
If we take 105 away from 122, we end up with 17.
Bring next digit (1) of the dividend behind the 17 and repeat the process: 171 / 21

Advancing to step 7:
21 goes into 171 8 times with a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 404358.0
Subtracting 168 from 171 leaves us with 3.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 21

On to step 8:
When dividing 32 by 21, we get 1 with a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 4043581.0
Deduct 21 from 32 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 9:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 4043581.5
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 10:
The number 21 fits into 50 2 times, leaving a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 4043581.52
If we take 42 away from 50, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 11:
If we divide 80 by 21, we get 3 and a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 4043581.523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 12:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 4043581.5238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 13:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 4043581.5238
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 14:
21 can be fit into 200 9 times, resulting in a remainder of 11.
The next digit of our result is 9. 
Result so far: 4043581.523809
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 15:
21 goes into 110 5 times with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 4043581.5238095
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 16:
21 goes into 50 2 times with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 4043581.52380952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

In conclusion, the division gives 4043581.52380952 with a balance of 8e-09.