523524 divided by 21 
We're looking to find how many times 21 goes into 523524.

On to step 1:
The number 21 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Include the next digit (2) from the dividend after 5, then repeat: 52 / 21

Going ahead to step 2:
The number 21 fits into 52 2 times, leaving a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 42 from 52, we get 10.
Include the next digit (3) from the dividend after 10, then repeat: 103 / 21

Moving on to step 3:
The number 21 fits into 103 4 times, leaving a remainder of 19.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
Deduct 84 from 103 and we're left with 19.
Append the next digit (5) from the dividend to 19 and continue with: 195 / 21

Advancing to step 4:
The number 21 fits into 195 9 times, leaving a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 249.0
If we subtract 189 from 195, we get 6.
Bring next digit (2) of the dividend behind the 6 and repeat the process: 62 / 21

Advancing to step 5:
21 goes into 62 2 times with a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 2492.0
If we take 42 away from 62, we end up with 20.
Append the next digit (4) from the dividend to 20 and continue with: 204 / 21

Going ahead to step 6:
21 goes into 204 9 times with a remainder of 15.
Put 9 as the next digit of the answer. 
Result so far: 24929.0
If we take 189 away from 204, 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.

Advancing to step 7:
150 divided by 21 is 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 24929.7
Subtracting 147 from 150 leaves us with 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 8:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 24929.71
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.

Let's proceed to step 9:
When dividing 90 by 21, we get 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 24929.714
Subtract 84 from 90 to get 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 10:
When dividing 60 by 21, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 24929.7142
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.

Moving on to step 11:
180 divided by 21 is 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 24929.71428
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.

Going ahead to step 12:
If we divide 120 by 21, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 24929.714285
If we subtract 105 from 120, we 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.

Moving on to step 13:
When dividing 150 by 21, we get 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 24929.7142857
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.

On to step 14:
30 divided by 21 is 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 24929.71428571
Subtracting 21 from 30 leaves us 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.

After the division, we end up with 24929.71428571 and a remainder of 9e-09.