We look at the division of 641799 by 21 
Our goal is to divide 641799 by 21.

Advancing to step 1:
When dividing 6 by 21, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 21

Let's proceed to step 2:
If we divide 64 by 21, we get 3 and a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtracting 63 from 64 leaves us with 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 21

Advancing to step 3:
When dividing 11 by 21, we get 0 with a remainder of 11.
Use 0 as the next digit of our solution. 
Result so far: 30.0
The remainder is 11 after subtracting 0 from 11.
Append the next digit (7) from the dividend to 11 and continue with: 117 / 21

Step 4:
The number 21 fits into 117 5 times, leaving a remainder of 12.
Use 5 as the next digit of our solution. 
Result so far: 305.0
The remainder is 12 after subtracting 105 from 117.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 21

On to step 5:
If we divide 129 by 21, we get 6 and a remainder of 3.
The number 6 becomes the next digit in our result. 
Result so far: 3056.0
Subtracting 126 from 129 leaves us with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 21

On to step 6:
21 goes into 39 1 times with a remainder of 18.
The number 1 becomes the next digit in our result. 
Result so far: 30561.0
The remainder is 18 after subtracting 21 from 39.
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 7:
21 goes into 180 8 times with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 30561.8
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.

Let's proceed to step 8:
21 goes into 120 5 times with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 30561.85
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.

Let's proceed to step 9:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 30561.857
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.

Step 10:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 30561.8571
If we subtract 21 from 30, we 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 11:
21 goes into 90 4 times with a remainder of 6.
The next digit of our result is 4. 
Result so far: 30561.85714
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.

Going ahead to step 12:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 30561.857142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 13:
When dividing 180 by 21, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 30561.8571428
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.

Let's proceed to step 14:
When dividing 120 by 21, we get 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 30561.85714285
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.

In conclusion, the division gives 30561.85714285 with a balance of 1.5e-08.