63872546 ÷ 21 
Let's see how many times 21 fits into 63872546.

Let's proceed to step 1:
6 divided by 21 is 0 with 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 (3) from the dividend, attach it to 6 and continue: 63 / 21

Moving on to step 2:
The number 21 fits into 63 3 times, leaving a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 63 from 63 leaves us with 0.
Grab the next digit (8) from the dividend, add it to 0, then carry on: 8 / 21

On to step 3:
8 divided by 21 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 30.0
Subtract 0 from 8 to get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 21

On to step 4:
21 goes into 87 4 times with a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 304.0
The remainder is 3 after subtracting 84 from 87.
Take the next digit (2) from the dividend and append it to 3, then repeat: 32 / 21

Advancing to step 5:
When dividing 32 by 21, we get 1 with a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 3041.0
Subtract 21 from 32 to get 11.
Take the next digit (5) from the dividend and append it to 11, then repeat: 115 / 21

Step 6:
115 divided by 21 is 5 with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 30415.0
The remainder is 10 after subtracting 105 from 115.
Append the next digit (4) from the dividend to 10 and continue with: 104 / 21

Let's proceed to step 7:
21 goes into 104 4 times with a remainder of 20.
Write down 4 as next digit of the result. 
Result so far: 304154.0
Deduct 84 from 104 and we're left with 20.
Bring next digit (6) of the dividend behind the 20 and repeat the process: 206 / 21

Advancing to step 8:
The number 21 fits into 206 9 times, leaving a remainder of 17.
Use 9 as the next digit of our solution. 
Result so far: 3041549.0
If we take 189 away from 206, 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.

Advancing to step 9:
The number 21 fits into 170 8 times, leaving a remainder of 2.
The next digit of our result is 8. 
Result so far: 3041549.8
If we take 168 away from 170, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 10:
The number 21 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 3041549.8
Subtracting 0 from 20 leaves us 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 11:
21 goes into 200 9 times with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 3041549.809
If we take 189 away from 200, we end up 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.

Moving on to step 12:
The number 21 fits into 110 5 times, leaving a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 3041549.8095
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.

Moving on to step 13:
21 goes into 50 2 times with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 3041549.80952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 14:
When dividing 80 by 21, we get 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 3041549.809523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 15:
21 goes into 170 8 times with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 3041549.8095238
If we subtract 168 from 170, we 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.

Let's proceed to step 16:
The number 21 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 3041549.8095238
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.

The quotient of the division is 3041549.8095238, and the remainder is 2e-08.