We're dividing 83193123 by 21 
We want to figure out the number of times 83193123 can be divided by 21.

Let's proceed to step 1:
If we divide 8 by 21, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (3) from the dividend after 8, then repeat: 83 / 21

Step 2:
21 can be fit into 83 3 times, resulting in a remainder of 20.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 63 from 83 and we're left with 20.
Include the next digit (1) from the dividend after 20, then repeat: 201 / 21

Step 3:
When dividing 201 by 21, we get 9 with a remainder of 12.
Write down 9 as next digit of the result. 
Result so far: 39.0
Deduct 189 from 201 and we're left with 12.
Fetch the next digit (9) from the dividend, attach it to 12 and continue: 129 / 21

Step 4:
If we divide 129 by 21, we get 6 and a remainder of 3.
Use 6 as the next digit of our solution. 
Result so far: 396.0
If we take 126 away from 129, we end up with 3.
Take the next digit (3) from the dividend and append it to 3, then repeat: 33 / 21

Step 5:
If we divide 33 by 21, we get 1 and a remainder of 12.
Put 1 as the next digit of the answer. 
Result so far: 3961.0
If we subtract 21 from 33, we get 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 21

Going ahead to step 6:
21 goes into 121 5 times with a remainder of 16.
Record the quotient 5 as the next digit in the result. 
Result so far: 39615.0
If we take 105 away from 121, we end up with 16.
Include the next digit (2) from the dividend after 16, then repeat: 162 / 21

Step 7:
21 can be fit into 162 7 times, resulting in a remainder of 15.
The next digit of our result is 7. 
Result so far: 396157.0
If we take 147 away from 162, we end up with 15.
Include the next digit (3) from the dividend after 15, then repeat: 153 / 21

Let's proceed to step 8:
If we divide 153 by 21, we get 7 and a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 3961577.0
If we take 147 away from 153, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 9:
When dividing 60 by 21, we get 2 with a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 3961577.2
If we take 42 away from 60, we end up 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.

Moving on to step 10:
21 goes into 180 8 times with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 3961577.28
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 11:
If we divide 120 by 21, we get 5 and a remainder of 15.
The next digit of our result is 5. 
Result so far: 3961577.285
If we take 105 away from 120, 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 12:
21 goes into 150 7 times with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 3961577.2857
Subtracting 147 from 150 leaves us 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.

Let's proceed to step 13:
If we divide 30 by 21, we get 1 and a remainder of 9.
The next digit of our result is 1. 
Result so far: 3961577.28571
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 14:
If we divide 90 by 21, we get 4 and a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 3961577.285714
Subtract 84 from 90 to 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.

Step 15:
60 divided by 21 is 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 3961577.2857142
If we take 42 away from 60, we end up 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 16:
If we divide 180 by 21, we get 8 and a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 3961577.28571428
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The quotient of the division is 3961577.28571428, and the remainder is 1.2e-08.