63489350 ÷ 21 
We're looking to find how many times 21 goes into 63489350.

Advancing to step 1:
6 divided by 21 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 21

On to step 2:
If we divide 63 by 21, we get 3 and a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 63 from 63 to get 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 21

Moving on to step 3:
The number 21 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 30.0
If we take 0 away from 4, we end up with 4.
Fetch the next digit (8) from the dividend, attach it to 4 and continue: 48 / 21

Advancing to step 4:
21 can be fit into 48 2 times, resulting in a remainder of 6.
Record the quotient 2 as the next digit in the result. 
Result so far: 302.0
Deduct 42 from 48 and we're left with 6.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 21

Going ahead to step 5:
If we divide 69 by 21, we get 3 and a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 3023.0
Subtract 63 from 69 to get 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 21

Moving on to step 6:
21 goes into 63 3 times with a remainder of 0.
The next digit of our result is 3. 
Result so far: 30233.0
If we subtract 63 from 63, we get 0.
Grab the next digit (5) from the dividend, add it to 0, then carry on: 5 / 21

On to step 7:
When dividing 5 by 21, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 302330.0
Deduct 0 from 5 and we're left with 5.
Include the next digit (0) from the dividend after 5, then repeat: 50 / 21

Let's proceed to step 8:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 3023302.0
Deduct 42 from 50 and we're left 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.

On to step 9:
21 goes into 80 3 times with a remainder of 17.
The next digit of our result is 3. 
Result so far: 3023302.3
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 10:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 3023302.38
Deduct 168 from 170 and we're left 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 11:
21 goes into 20 0 times with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 3023302.38
If we subtract 0 from 20, we 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.

Going ahead to step 12:
200 divided by 21 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 3023302.3809
Subtracting 189 from 200 leaves us 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.

Advancing to step 13:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 3023302.38095
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.

On to step 14:
21 goes into 50 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 3023302.380952
Deduct 42 from 50 and we're left 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.

Moving on to step 15:
80 divided by 21 is 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 3023302.3809523
If we subtract 63 from 80, we 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 16:
If we divide 170 by 21, we get 8 and a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 3023302.38095238
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.

In conclusion, the division gives 3023302.38095238 with a balance of 2e-09.