576591 ÷ 21 
Let's see how many times 21 fits into 576591.

Let's proceed to step 1:
If we divide 5 by 21, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 21

Step 2:
21 goes into 57 2 times with a remainder of 15.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 42 away from 57, we end up with 15.
Bring next digit (6) of the dividend behind the 15 and repeat the process: 156 / 21

Let's proceed to step 3:
If we divide 156 by 21, we get 7 and a remainder of 9.
The next digit of our result is 7. 
Result so far: 27.0
The remainder is 9 after subtracting 147 from 156.
Fetch the next digit (5) from the dividend, attach it to 9 and continue: 95 / 21

Moving on to step 4:
If we divide 95 by 21, we get 4 and a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 274.0
The remainder is 11 after subtracting 84 from 95.
Include the next digit (9) from the dividend after 11, then repeat: 119 / 21

Advancing to step 5:
When dividing 119 by 21, we get 5 with a remainder of 14.
Write down 5 as next digit of the result. 
Result so far: 2745.0
Subtracting 105 from 119 leaves us with 14.
Take the next digit (1) from the dividend and append it to 14, then repeat: 141 / 21

Advancing to step 6:
141 divided by 21 is 6 with a remainder of 15.
The number 6 becomes the next digit in our result. 
Result so far: 27456.0
The remainder is 15 after subtracting 126 from 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 7:
When dividing 150 by 21, we get 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 27456.7
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 8:
The number 21 fits into 30 1 times, leaving a remainder of 9.
The next digit of our result is 1. 
Result so far: 27456.71
If we take 21 away from 30, we end up 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.

Step 9:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 27456.714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to 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: 27456.7142
Subtracting 42 from 60 leaves us 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.

Step 11:
When dividing 180 by 21, we get 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 27456.71428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 12:
21 can be fit into 120 5 times, resulting in a remainder of 15.
The next digit of our result is 5. 
Result so far: 27456.714285
The remainder is 15 after subtracting 105 from 120.
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 13:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 27456.7142857
Subtract 147 from 150 to 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.

Going ahead to step 14:
21 goes into 30 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 27456.71428571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

The final outcome is 27456.71428571, with a leftover of 9e-09.