We're dividing 575311 by 21 
We want to figure out the number of times 575311 can be divided by 21.

Step 1:
21 goes into 5 0 times with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 21

Going ahead to step 2:
57 divided by 21 is 2 with a remainder of 15.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 42 away from 57, we end up with 15.
Bring next digit (5) of the dividend behind the 15 and repeat the process: 155 / 21

Moving on to step 3:
The number 21 fits into 155 7 times, leaving a remainder of 8.
Write down 7 as next digit of the result. 
Result so far: 27.0
Subtracting 147 from 155 leaves us with 8.
Include the next digit (3) from the dividend after 8, then repeat: 83 / 21

Moving on to step 4:
When dividing 83 by 21, we get 3 with a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 273.0
Subtracting 63 from 83 leaves us with 20.
Bring next digit (1) of the dividend behind the 20 and repeat the process: 201 / 21

Advancing to step 5:
If we divide 201 by 21, we get 9 and a remainder of 12.
Record the quotient 9 as the next digit in the result. 
Result so far: 2739.0
Subtract 189 from 201 to get 12.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 21

Advancing to step 6:
When dividing 121 by 21, we get 5 with a remainder of 16.
Write down 5 as next digit of the result. 
Result so far: 27395.0
Subtract 105 from 121 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 7:
21 goes into 160 7 times with a remainder of 13.
The next digit of our result is 7. 
Result so far: 27395.7
Deduct 147 from 160 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 8:
When dividing 130 by 21, we get 6 with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 27395.76
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 9:
40 divided by 21 is 1 with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 27395.761
If we subtract 21 from 40, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 10:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 27395.7619
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 11:
If we divide 10 by 21, we get 0 and a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 27395.7619
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 12:
21 can be fit into 100 4 times, resulting in a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 27395.761904
Subtract 84 from 100 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 13:
If we divide 160 by 21, we get 7 and a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 27395.7619047
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 14:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 27395.76190476
Deduct 126 from 130 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Our division results in 27395.76190476 with a remaining 4e-09.