We're dividing 84877904 by 21 
We want to divide 84877904 by 21.

Advancing 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
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 21

Step 2:
21 can be fit into 84 4 times, resulting in a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 0 after subtracting 84 from 84.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 21

On to step 3:
21 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 21

Let's proceed to step 4:
If we divide 87 by 21, we get 4 and a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 404.0
The remainder is 3 after subtracting 84 from 87.
Take the next digit (7) from the dividend and append it to 3, then repeat: 37 / 21

Moving on to step 5:
21 goes into 37 1 times with a remainder of 16.
The next digit of our result is 1. 
Result so far: 4041.0
If we subtract 21 from 37, we get 16.
Take the next digit (9) from the dividend and append it to 16, then repeat: 169 / 21

Going ahead to step 6:
21 goes into 169 8 times with a remainder of 1.
Put 8 as the next digit of the answer. 
Result so far: 40418.0
Subtract 168 from 169 to get 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 21

Step 7:
10 divided by 21 is 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 404180.0
The remainder is 10 after subtracting 0 from 10.
Append the next digit (4) from the dividend to 10 and continue with: 104 / 21

On to step 8:
21 can be fit into 104 4 times, resulting in a remainder of 20.
Write down 4 as next digit of the result. 
Result so far: 4041804.0
Subtract 84 from 104 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 9:
200 divided by 21 is 9 with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 4041804.9
If we take 189 away from 200, we end up 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 10:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The next digit of our result is 5. 
Result so far: 4041804.95
Subtract 105 from 110 to get 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 11:
If we divide 50 by 21, we get 2 and a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 4041804.952
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 12:
21 goes into 80 3 times with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 4041804.9523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 13:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 4041804.95238
If we take 168 away from 170, we end up 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.

Moving on to step 14:
21 goes into 20 0 times with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 4041804.95238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 15:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 4041804.9523809
If we subtract 189 from 200, we 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.

Let's proceed to step 16:
21 goes into 110 5 times with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 4041804.95238095
Deduct 105 from 110 and we're left 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.

After the division, we end up with 4041804.95238095 and a remainder of 5e-09.