862666 divided by 21 
We want to divide 862666 by 21.

Let's proceed to step 1:
When dividing 8 by 21, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 21

Going ahead to step 2:
86 divided by 21 is 4 with a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 2 after subtracting 84 from 86.
Grab the next digit (2) from the dividend, add it to 2, then carry on: 22 / 21

Moving on to step 3:
21 goes into 22 1 times with a remainder of 1.
The next digit of our result is 1. 
Result so far: 41.0
If we take 21 away from 22, we end up with 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 21

On to step 4:
21 can be fit into 16 0 times, resulting in a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 410.0
Subtract 0 from 16 to get 16.
Fetch the next digit (6) from the dividend, attach it to 16 and continue: 166 / 21

Moving on to step 5:
21 goes into 166 7 times with a remainder of 19.
Write down 7 as next digit of the result. 
Result so far: 4107.0
Deduct 147 from 166 and we're left with 19.
Take the next digit (6) from the dividend and append it to 19, then repeat: 196 / 21

Let's proceed to step 6:
196 divided by 21 is 9 with a remainder of 7.
Write down 9 as next digit of the result. 
Result so far: 41079.0
Deduct 189 from 196 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 7:
If we divide 70 by 21, we get 3 and a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 41079.3
Subtracting 63 from 70 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 8:
21 goes into 70 3 times with a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 41079.33
Subtract 63 from 70 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

After the division, we end up with 41079.33 and a remainder of 0.007.