21831902 ÷ 39 
We want to figure out the number of times 21831902 can be divided by 39.

Let's proceed to step 1:
The number 39 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 39

Step 2:
39 goes into 21 0 times with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Append the next digit (8) from the dividend to 21 and continue with: 218 / 39

Moving on to step 3:
218 divided by 39 is 5 with a remainder of 23.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we take 195 away from 218, we end up with 23.
Include the next digit (3) from the dividend after 23, then repeat: 233 / 39

Advancing to step 4:
233 divided by 39 is 5 with a remainder of 38.
Write down 5 as next digit of the result. 
Result so far: 55.0
The remainder is 38 after subtracting 195 from 233.
Include the next digit (1) from the dividend after 38, then repeat: 381 / 39

On to step 5:
39 can be fit into 381 9 times, resulting in a remainder of 30.
Record the quotient 9 as the next digit in the result. 
Result so far: 559.0
Deduct 351 from 381 and we're left with 30.
Grab the next digit (9) from the dividend, add it to 30, then carry on: 309 / 39

Advancing to step 6:
39 can be fit into 309 7 times, resulting in a remainder of 36.
Record the quotient 7 as the next digit in the result. 
Result so far: 5597.0
Subtracting 273 from 309 leaves us with 36.
Bring next digit (0) of the dividend behind the 36 and repeat the process: 360 / 39

Advancing to step 7:
The number 39 fits into 360 9 times, leaving a remainder of 9.
Use 9 as the next digit of our solution. 
Result so far: 55979.0
If we subtract 351 from 360, we get 9.
Include the next digit (2) from the dividend after 9, then repeat: 92 / 39

On to step 8:
92 divided by 39 is 2 with a remainder of 14.
The next digit of our result is 2. 
Result so far: 559792.0
Deduct 78 from 92 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 9:
The number 39 fits into 140 3 times, leaving a remainder of 23.
Record the quotient 3 as the next digit in the result. 
Result so far: 559792.3
Deduct 117 from 140 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 10:
39 can be fit into 230 5 times, resulting in a remainder of 35.
The next digit of our result is 5. 
Result so far: 559792.35
Deduct 195 from 230 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 11:
The number 39 fits into 350 8 times, leaving a remainder of 38.
The number 8 becomes the next digit in our result. 
Result so far: 559792.358
Subtracting 312 from 350 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 12:
39 can be fit into 380 9 times, resulting in a remainder of 29.
Write down 9 as next digit of the result. 
Result so far: 559792.3589
The remainder is 29 after subtracting 351 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 13:
39 can be fit into 290 7 times, resulting in a remainder of 17.
Record the quotient 7 as the next digit in the result. 
Result so far: 559792.35897
The remainder is 17 after subtracting 273 from 290.
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 14:
When dividing 170 by 39, we get 4 with a remainder of 14.
The number 4 becomes the next digit in our result. 
Result so far: 559792.358974
If we subtract 156 from 170, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 15:
When dividing 140 by 39, we get 3 with a remainder of 23.
The number 3 becomes the next digit in our result. 
Result so far: 559792.3589743
If we take 117 away from 140, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 16:
The number 39 fits into 230 5 times, leaving a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 559792.35897435
Deduct 195 from 230 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The final outcome is 559792.35897435, with a leftover of 3.5e-08.