Let's divide 21131901 by 797
We want to figure out the number of times 21131901 can be divided by 797.

Step 1:
If we divide 2 by 797, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 797

Going ahead to step 2:
797 goes into 21 0 times with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Fetch the next digit (1) from the dividend, attach it to 21 and continue: 211 / 797

Going ahead to step 3:
797 can be fit into 211 0 times, resulting in a remainder of 211.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 211, we get 211.
Bring next digit (3) of the dividend behind the 211 and repeat the process: 2113 / 797

Let's proceed to step 4:
797 goes into 2113 2 times with a remainder of 519.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 1594 from 2113 leaves us with 519.
Include the next digit (1) from the dividend after 519, then repeat: 5191 / 797

On to step 5:
If we divide 5191 by 797, we get 6 and a remainder of 409.
Use 6 as the next digit of our solution. 
Result so far: 26.0
Subtracting 4782 from 5191 leaves us with 409.
Fetch the next digit (9) from the dividend, attach it to 409 and continue: 4099 / 797

Let's proceed to step 6:
The number 797 fits into 4099 5 times, leaving a remainder of 114.
Put 5 as the next digit of the answer. 
Result so far: 265.0
Subtract 3985 from 4099 to get 114.
Bring next digit (0) of the dividend behind the 114 and repeat the process: 1140 / 797

Advancing to step 7:
The number 797 fits into 1140 1 times, leaving a remainder of 343.
The number 1 becomes the next digit in our result. 
Result so far: 2651.0
If we take 797 away from 1140, we end up with 343.
Include the next digit (1) from the dividend after 343, then repeat: 3431 / 797

Let's proceed to step 8:
The number 797 fits into 3431 4 times, leaving a remainder of 243.
Put 4 as the next digit of the answer. 
Result so far: 26514.0
Subtracting 3188 from 3431 leaves us with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Going ahead to step 9:
When dividing 2430 by 797, we get 3 with a remainder of 39.
Use 3 as the next digit of our solution. 
Result so far: 26514.3
Deduct 2391 from 2430 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 10:
The number 797 fits into 390 0 times, leaving a remainder of 390.
The next digit of our result is 0. 
Result so far: 26514.3
Deduct 0 from 390 and we're left with 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Moving on to step 11:
The number 797 fits into 3900 4 times, leaving a remainder of 712.
Write down 4 as next digit of the result. 
Result so far: 26514.304
Subtract 3188 from 3900 to get 712.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7120, and continue the process.

Let's proceed to step 12:
797 goes into 7120 8 times with a remainder of 744.
Write down 8 as next digit of the result. 
Result so far: 26514.3048
Deduct 6376 from 7120 and we're left with 744.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7440, and continue the process.

Let's proceed to step 13:
797 goes into 7440 9 times with a remainder of 267.
The next digit of our result is 9. 
Result so far: 26514.30489
Subtracting 7173 from 7440 leaves us with 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

Moving on to step 14:
797 goes into 2670 3 times with a remainder of 279.
The next digit of our result is 3. 
Result so far: 26514.304893
If we take 2391 away from 2670, we end up with 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

Step 15:
797 goes into 2790 3 times with a remainder of 399.
The number 3 becomes the next digit in our result. 
Result so far: 26514.3048933
If we subtract 2391 from 2790, we get 399.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3990, and continue the process.

The final outcome is 26514.3048933, with a leftover of 3.99e-06.