We divide 641486 by 21
We're looking to find how many times 21 goes into 641486.

Let's proceed to step 1:
If we divide 6 by 21, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 21

Moving on to step 2:
21 can be fit into 64 3 times, resulting in a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Deduct 63 from 64 and we're left with 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 21

Moving on to step 3:
21 goes into 11 0 times with a remainder of 11.
Use 0 as the next digit of our solution. 
Result so far: 30.0
Deduct 0 from 11 and we're left with 11.
Fetch the next digit (4) from the dividend, attach it to 11 and continue: 114 / 21

On to step 4:
21 can be fit into 114 5 times, resulting in a remainder of 9.
Put 5 as the next digit of the answer. 
Result so far: 305.0
Subtracting 105 from 114 leaves us with 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 21

Going ahead to step 5:
21 goes into 98 4 times with a remainder of 14.
Write down 4 as next digit of the result. 
Result so far: 3054.0
Subtracting 84 from 98 leaves us with 14.
Bring next digit (6) of the dividend behind the 14 and repeat the process: 146 / 21

On to step 6:
21 goes into 146 6 times with a remainder of 20.
The next digit of our result is 6. 
Result so far: 30546.0
Subtract 126 from 146 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 7:
21 goes into 200 9 times with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 30546.9
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 8:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 30546.95
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 9:
50 divided by 21 is 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 30546.952
Subtracting 42 from 50 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 10:
80 divided by 21 is 3 with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 30546.9523
If we take 63 away from 80, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 11:
If we divide 170 by 21, we get 8 and a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 30546.95238
Subtract 168 from 170 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 12:
The number 21 fits into 20 0 times, leaving a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 30546.95238
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 13:
21 goes into 200 9 times with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 30546.9523809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 14:
110 divided by 21 is 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 30546.95238095
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

In conclusion, the division gives 30546.95238095 with a balance of 5e-09.