74171364 ÷ 21 
Our goal is to divide 74171364 by 21.

On to step 1:
The number 21 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Bring next digit (4) of the dividend behind the 7 and repeat the process: 74 / 21

Moving on to step 2:
If we divide 74 by 21, we get 3 and a remainder of 11.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 63 from 74, we get 11.
Fetch the next digit (1) from the dividend, attach it to 11 and continue: 111 / 21

Moving on to step 3:
111 divided by 21 is 5 with a remainder of 6.
Put 5 as the next digit of the answer. 
Result so far: 35.0
If we subtract 105 from 111, we get 6.
Take the next digit (7) from the dividend and append it to 6, then repeat: 67 / 21

On to step 4:
21 goes into 67 3 times with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 353.0
Subtracting 63 from 67 leaves us with 4.
Append the next digit (1) from the dividend to 4 and continue with: 41 / 21

Let's proceed to step 5:
41 divided by 21 is 1 with a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 3531.0
Subtracting 21 from 41 leaves us with 20.
Bring next digit (3) of the dividend behind the 20 and repeat the process: 203 / 21

Going ahead to step 6:
When dividing 203 by 21, we get 9 with a remainder of 14.
The number 9 becomes the next digit in our result. 
Result so far: 35319.0
If we take 189 away from 203, we end up with 14.
Append the next digit (6) from the dividend to 14 and continue with: 146 / 21

Moving on to step 7:
21 goes into 146 6 times with a remainder of 20.
Use 6 as the next digit of our solution. 
Result so far: 353196.0
If we subtract 126 from 146, we get 20.
Fetch the next digit (4) from the dividend, attach it to 20 and continue: 204 / 21

Moving on to step 8:
21 goes into 204 9 times with a remainder of 15.
Put 9 as the next digit of the answer. 
Result so far: 3531969.0
If we take 189 away from 204, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 9:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 3531969.7
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 10:
The number 21 fits into 30 1 times, leaving a remainder of 9.
The next digit of our result is 1. 
Result so far: 3531969.71
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 11:
If we divide 90 by 21, we get 4 and a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 3531969.714
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 12:
If we divide 60 by 21, we get 2 and a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 3531969.7142
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 13:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 3531969.71428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 14:
When dividing 120 by 21, we get 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 3531969.714285
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 15:
When dividing 150 by 21, we get 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 3531969.7142857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 16:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 3531969.71428571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

The final outcome is 3531969.71428571, with a leftover of 9e-09.