We're dividing 523201 by 21 
We want to figure out the number of times 523201 can be divided by 21.

Let's proceed to step 1:
If we divide 5 by 21, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 21

On to step 2:
21 goes into 52 2 times with 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.
Fetch the next digit (3) from the dividend, attach it to 10 and continue: 103 / 21

Advancing to step 3:
21 goes into 103 4 times with a remainder of 19.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
If we take 84 away from 103, we end up with 19.
Fetch the next digit (2) from the dividend, attach it to 19 and continue: 192 / 21

Going ahead to step 4:
21 can be fit into 192 9 times, resulting in a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 249.0
If we subtract 189 from 192, we get 3.
Take the next digit (0) from the dividend and append it to 3, then repeat: 30 / 21

Going ahead to step 5:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 2491.0
The remainder is 9 after subtracting 21 from 30.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 21

Moving on to step 6:
When dividing 91 by 21, we get 4 with a remainder of 7.
Record the quotient 4 as the next digit in the result. 
Result so far: 24914.0
The remainder is 7 after subtracting 84 from 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
If we divide 70 by 21, we get 3 and a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 24914.3
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 8:
21 can be fit into 70 3 times, resulting in a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 24914.33
If we take 63 away from 70, we end up 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.

After the division, we end up with 24914.33 and a remainder of 0.007.