Let's divide 521267 by 21
We want to figure out the number of times 521267 can be divided by 21.

Moving on to step 1:
21 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 21

On to step 2:
If we divide 52 by 21, we get 2 and a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 42 from 52 and we're left with 10.
Take the next digit (1) from the dividend and append it to 10, then repeat: 101 / 21

Going ahead to step 3:
When dividing 101 by 21, we get 4 with a remainder of 17.
The next digit of our result is 4. 
Result so far: 24.0
The remainder is 17 after subtracting 84 from 101.
Take the next digit (2) from the dividend and append it to 17, then repeat: 172 / 21

Step 4:
172 divided by 21 is 8 with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 248.0
If we take 168 away from 172, we end up with 4.
Grab the next digit (6) from the dividend, add it to 4, then carry on: 46 / 21

Going ahead to step 5:
21 goes into 46 2 times with a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 2482.0
If we take 42 away from 46, we end up with 4.
Fetch the next digit (7) from the dividend, attach it to 4 and continue: 47 / 21

Moving on to step 6:
47 divided by 21 is 2 with a remainder of 5.
The next digit of our result is 2. 
Result so far: 24822.0
If we take 42 away from 47, we end up 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.

Moving on to step 7:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 24822.2
Deduct 42 from 50 and we're left with 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 8:
When dividing 80 by 21, we get 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 24822.23
Subtracting 63 from 80 leaves us 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 9:
When dividing 170 by 21, we get 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 24822.238
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.

On to step 10:
The number 21 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 24822.238
If we subtract 0 from 20, we 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.

Step 11:
21 can be fit into 200 9 times, resulting in a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 24822.23809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 12:
110 divided by 21 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 24822.238095
If we take 105 away from 110, we end up 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.

Advancing to step 13:
21 goes into 50 2 times with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 24822.2380952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 14:
21 goes into 80 3 times with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 24822.23809523
Subtracting 63 from 80 leaves us 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.

In conclusion, the division gives 24822.23809523 with a balance of 1.7e-08.