36678688 ÷ 21 
We're looking to find how many times 21 goes into 36678688.

Moving on to step 1:
The number 21 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (6) from the dividend to 3 and continue with: 36 / 21

Step 2:
21 goes into 36 1 times with a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 21 from 36 and we're left with 15.
Take the next digit (6) from the dividend and append it to 15, then repeat: 156 / 21

Step 3:
21 goes into 156 7 times with a remainder of 9.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
If we take 147 away from 156, we end up with 9.
Take the next digit (7) from the dividend and append it to 9, then repeat: 97 / 21

Let's proceed to step 4:
21 goes into 97 4 times with a remainder of 13.
Put 4 as the next digit of the answer. 
Result so far: 174.0
If we subtract 84 from 97, we get 13.
Bring next digit (8) of the dividend behind the 13 and repeat the process: 138 / 21

Step 5:
If we divide 138 by 21, we get 6 and a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 1746.0
If we take 126 away from 138, we end up with 12.
Include the next digit (6) from the dividend after 12, then repeat: 126 / 21

Going ahead to step 6:
21 goes into 126 6 times with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 17466.0
Subtract 126 from 126 to get 0.
Grab the next digit (8) from the dividend, add it to 0, then carry on: 8 / 21

Moving on to step 7:
21 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 174660.0
Subtract 0 from 8 to get 8.
Take the next digit (8) from the dividend and append it to 8, then repeat: 88 / 21

On to step 8:
The number 21 fits into 88 4 times, leaving a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 1746604.0
If we subtract 84 from 88, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 9:
40 divided by 21 is 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 1746604.1
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.

On to step 10:
190 divided by 21 is 9 with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 1746604.19
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.

Going ahead to step 11:
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: 1746604.19
If we take 0 away from 10, 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.

Going ahead to step 12:
If we divide 100 by 21, we get 4 and a remainder of 16.
The next digit of our result is 4. 
Result so far: 1746604.1904
Deduct 84 from 100 and we're left 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 13:
21 can be fit into 160 7 times, resulting in a remainder of 13.
The next digit of our result is 7. 
Result so far: 1746604.19047
Deduct 147 from 160 and we're left 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.

Going ahead to step 14:
21 goes into 130 6 times with a remainder of 4.
The next digit of our result is 6. 
Result so far: 1746604.190476
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 15:
When dividing 40 by 21, we get 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 1746604.1904761
If we take 21 away from 40, we end up 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.

Moving on to step 16:
When dividing 190 by 21, we get 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 1746604.19047619
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.

The final outcome is 1746604.19047619, with a leftover of 1e-09.