63137602 ÷ 21 
We want to figure out the number of times 63137602 can be divided by 21.

Step 1:
When dividing 6 by 21, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 21

Step 2:
63 divided by 21 is 3 with a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Deduct 63 from 63 and we're left with 0.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 21

Moving on to step 3:
When dividing 1 by 21, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 30.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 21

Moving on to step 4:
21 can be fit into 13 0 times, resulting in a remainder of 13.
The next digit of our result is 0. 
Result so far: 300.0
Subtracting 0 from 13 leaves us with 13.
Include the next digit (7) from the dividend after 13, then repeat: 137 / 21

Let's proceed to step 5:
21 can be fit into 137 6 times, resulting in a remainder of 11.
The number 6 becomes the next digit in our result. 
Result so far: 3006.0
Deduct 126 from 137 and we're left with 11.
Grab the next digit (6) from the dividend, add it to 11, then carry on: 116 / 21

Moving on to step 6:
If we divide 116 by 21, we get 5 and a remainder of 11.
The number 5 becomes the next digit in our result. 
Result so far: 30065.0
Subtract 105 from 116 to get 11.
Fetch the next digit (0) from the dividend, attach it to 11 and continue: 110 / 21

Let's proceed to step 7:
110 divided by 21 is 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 300655.0
Subtract 105 from 110 to get 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 21

Moving on to step 8:
52 divided by 21 is 2 with a remainder of 10.
Put 2 as the next digit of the answer. 
Result so far: 3006552.0
If we take 42 away from 52, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 9:
100 divided by 21 is 4 with a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 3006552.4
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 10:
If we divide 160 by 21, we get 7 and a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 3006552.47
Subtracting 147 from 160 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 11:
The number 21 fits into 130 6 times, leaving a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 3006552.476
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 12:
When dividing 40 by 21, we get 1 with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 3006552.4761
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 13:
If we divide 190 by 21, we get 9 and a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 3006552.47619
If we subtract 189 from 190, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 14:
21 can be fit into 10 0 times, resulting in a remainder of 10.
The next digit of our result is 0. 
Result so far: 3006552.47619
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 15:
100 divided by 21 is 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 3006552.4761904
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 16:
The number 21 fits into 160 7 times, leaving a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 3006552.47619047
If we take 147 away from 160, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The quotient of the division is 3006552.47619047, and the remainder is 1.3e-08.