We divide 621594 by 21
We want to figure out the number of times 621594 can be divided by 21.

Moving on to step 1:
21 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 21

Advancing to step 2:
62 divided by 21 is 2 with a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 42 from 62, we get 20.
Fetch the next digit (1) from the dividend, attach it to 20 and continue: 201 / 21

Let's proceed to step 3:
When dividing 201 by 21, we get 9 with a remainder of 12.
Put 9 as the next digit of the answer. 
Result so far: 29.0
If we take 189 away from 201, we end up with 12.
Fetch the next digit (5) from the dividend, attach it to 12 and continue: 125 / 21

Going ahead to step 4:
21 goes into 125 5 times with a remainder of 20.
Record the quotient 5 as the next digit in the result. 
Result so far: 295.0
Subtract 105 from 125 to get 20.
Include the next digit (9) from the dividend after 20, then repeat: 209 / 21

On to step 5:
21 can be fit into 209 9 times, resulting in a remainder of 20.
The next digit of our result is 9. 
Result so far: 2959.0
Subtracting 189 from 209 leaves us with 20.
Bring next digit (4) of the dividend behind the 20 and repeat the process: 204 / 21

Step 6:
204 divided by 21 is 9 with a remainder of 15.
Use 9 as the next digit of our solution. 
Result so far: 29599.0
If we take 189 away from 204, we end up 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.

Let's proceed to step 7:
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: 29599.7
If we take 147 away from 150, we end up 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.

On to step 8:
30 divided by 21 is 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 29599.71
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.

Moving on to step 9:
When dividing 90 by 21, we get 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 29599.714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 10:
60 divided by 21 is 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 29599.7142
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.

Advancing to step 11:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 29599.71428
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.

Moving on to step 12:
The number 21 fits into 120 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 29599.714285
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.

Let's proceed to step 13:
The number 21 fits into 150 7 times, leaving a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 29599.7142857
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.

Moving on to step 14:
When dividing 30 by 21, we get 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 29599.71428571
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 quotient of the division is 29599.71428571, and the remainder is 9e-09.