612588 ÷ 21 
Our goal is to divide 612588 by 21.

Going ahead to step 1:
21 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (1) from the dividend, attach it to 6 and continue: 61 / 21

Let's proceed to step 2:
61 divided by 21 is 2 with a remainder of 19.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 42 from 61 leaves us with 19.
Grab the next digit (2) from the dividend, add it to 19, then carry on: 192 / 21

Let's proceed to step 3:
If we divide 192 by 21, we get 9 and a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 29.0
If we subtract 189 from 192, we get 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 21

Going ahead to step 4:
If we divide 35 by 21, we get 1 and a remainder of 14.
The next digit of our result is 1. 
Result so far: 291.0
The remainder is 14 after subtracting 21 from 35.
Take the next digit (8) from the dividend and append it to 14, then repeat: 148 / 21

Moving on to step 5:
148 divided by 21 is 7 with a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 2917.0
Deduct 147 from 148 and we're left with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 21

Let's proceed to step 6:
If we divide 18 by 21, we get 0 and a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 29170.0
If we subtract 0 from 18, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 7:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 29170.8
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 8:
When dividing 120 by 21, we get 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 29170.85
If we subtract 105 from 120, we get 15.
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 9:
If we divide 150 by 21, we get 7 and a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 29170.857
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 10:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 29170.8571
Deduct 21 from 30 and we're left 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.

Advancing to step 11:
90 divided by 21 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 29170.85714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 12:
If we divide 60 by 21, we get 2 and a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 29170.857142
Deduct 42 from 60 and we're left 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.

On to step 13:
21 goes into 180 8 times with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 29170.8571428
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 14:
21 goes into 120 5 times with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 29170.85714285
Deduct 105 from 120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The quotient of the division is 29170.85714285, and the remainder is 1.5e-08.