We look at the division of 528765 by 21 
We want to divide 528765 by 21.

Advancing to step 1:
If we divide 5 by 21, we get 0 and a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 21

Advancing to step 2:
The number 21 fits into 52 2 times, leaving a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 42 away from 52, we end up with 10.
Take the next digit (8) from the dividend and append it to 10, then repeat: 108 / 21

Moving on to step 3:
The number 21 fits into 108 5 times, leaving a remainder of 3.
The next digit of our result is 5. 
Result so far: 25.0
Subtract 105 from 108 to get 3.
Append the next digit (7) from the dividend to 3 and continue with: 37 / 21

Moving on to step 4:
37 divided by 21 is 1 with a remainder of 16.
Put 1 as the next digit of the answer. 
Result so far: 251.0
The remainder is 16 after subtracting 21 from 37.
Bring next digit (6) of the dividend behind the 16 and repeat the process: 166 / 21

Let's proceed to step 5:
21 goes into 166 7 times with a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 2517.0
Subtract 147 from 166 to get 19.
Append the next digit (5) from the dividend to 19 and continue with: 195 / 21

Let's proceed to step 6:
21 goes into 195 9 times with a remainder of 6.
The next digit of our result is 9. 
Result so far: 25179.0
The remainder is 6 after subtracting 189 from 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 7:
When dividing 60 by 21, we get 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 25179.2
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.

Moving on to step 8:
When dividing 180 by 21, we get 8 with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 25179.28
Subtract 168 from 180 to get 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 9:
120 divided by 21 is 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 25179.285
If we take 105 away from 120, we end up 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.

Moving on to step 10:
150 divided by 21 is 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 25179.2857
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.

Step 11:
If we divide 30 by 21, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 25179.28571
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 12:
When dividing 90 by 21, we get 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 25179.285714
Subtracting 84 from 90 leaves us 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.

Step 13:
60 divided by 21 is 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 25179.2857142
If we take 42 away from 60, we end up 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.

On to step 14:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The next digit of our result is 8. 
Result so far: 25179.28571428
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.

The final outcome is 25179.28571428, with a leftover of 1.2e-08.