We look at the division of 75492653 by 21 
We want to figure out the number of times 75492653 can be divided by 21.

Step 1:
21 goes into 7 0 times with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Include the next digit (5) from the dividend after 7, then repeat: 75 / 21

Step 2:
75 divided by 21 is 3 with a remainder of 12.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we take 63 away from 75, we end up with 12.
Take the next digit (4) from the dividend and append it to 12, then repeat: 124 / 21

Going ahead to step 3:
The number 21 fits into 124 5 times, leaving a remainder of 19.
The next digit of our result is 5. 
Result so far: 35.0
Subtract 105 from 124 to get 19.
Grab the next digit (9) from the dividend, add it to 19, then carry on: 199 / 21

Step 4:
The number 21 fits into 199 9 times, leaving a remainder of 10.
Record the quotient 9 as the next digit in the result. 
Result so far: 359.0
If we subtract 189 from 199, we get 10.
Bring next digit (2) of the dividend behind the 10 and repeat the process: 102 / 21

Advancing to step 5:
If we divide 102 by 21, we get 4 and a remainder of 18.
Put 4 as the next digit of the answer. 
Result so far: 3594.0
Subtract 84 from 102 to get 18.
Bring next digit (6) of the dividend behind the 18 and repeat the process: 186 / 21

Advancing to step 6:
The number 21 fits into 186 8 times, leaving a remainder of 18.
Write down 8 as next digit of the result. 
Result so far: 35948.0
Subtract 168 from 186 to get 18.
Include the next digit (5) from the dividend after 18, then repeat: 185 / 21

Going ahead to step 7:
When dividing 185 by 21, we get 8 with a remainder of 17.
The next digit of our result is 8. 
Result so far: 359488.0
Subtract 168 from 185 to get 17.
Fetch the next digit (3) from the dividend, attach it to 17 and continue: 173 / 21

Moving on to step 8:
21 goes into 173 8 times with a remainder of 5.
Use 8 as the next digit of our solution. 
Result so far: 3594888.0
The remainder is 5 after subtracting 168 from 173.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 9:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 3594888.2
If we take 42 away from 50, we end up 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 10:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 3594888.23
Deduct 63 from 80 and we're left 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.

Let's proceed to step 11:
If we divide 170 by 21, we get 8 and a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 3594888.238
Subtract 168 from 170 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 12:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 3594888.238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 13:
When dividing 200 by 21, we get 9 with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 3594888.23809
Subtracting 189 from 200 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 14:
If we divide 110 by 21, we get 5 and a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 3594888.238095
Subtracting 105 from 110 leaves us 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 15:
21 goes into 50 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 3594888.2380952
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.

On to step 16:
When dividing 80 by 21, we get 3 with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 3594888.23809523
Deduct 63 from 80 and we're left 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.

The quotient of the division is 3594888.23809523, and the remainder is 1.7e-08.