Let's divide 21241975 by 12
Let's see how many times 12 fits into 21241975.

Going ahead to step 1:
The number 12 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 12

Step 2:
12 goes into 21 1 times with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 12 from 21 leaves us with 9.
Append the next digit (2) from the dividend to 9 and continue with: 92 / 12

Let's proceed to step 3:
When dividing 92 by 12, we get 7 with a remainder of 8.
Put 7 as the next digit of the answer. 
Result so far: 17.0
The remainder is 8 after subtracting 84 from 92.
Take the next digit (4) from the dividend and append it to 8, then repeat: 84 / 12

On to step 4:
When dividing 84 by 12, we get 7 with a remainder of 0.
Record the quotient 7 as the next digit in the result. 
Result so far: 177.0
Subtract 84 from 84 to get 0.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 12

Advancing to step 5:
12 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 1770.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 12

Step 6:
The number 12 fits into 19 1 times, leaving a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 17701.0
If we take 12 away from 19, we end up with 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 12

Advancing to step 7:
When dividing 77 by 12, we get 6 with a remainder of 5.
Record the quotient 6 as the next digit in the result. 
Result so far: 177016.0
Subtract 72 from 77 to get 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 12

Moving on to step 8:
The number 12 fits into 55 4 times, leaving a remainder of 7.
Use 4 as the next digit of our solution. 
Result so far: 1770164.0
If we subtract 48 from 55, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 9:
If we divide 70 by 12, we get 5 and a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 1770164.5
Subtracting 60 from 70 leaves us 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.

On to step 10:
When dividing 100 by 12, we get 8 with a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 1770164.58
Deduct 96 from 100 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 11:
12 can be fit into 40 3 times, resulting in a remainder of 4.
The next digit of our result is 3. 
Result so far: 1770164.583
If we subtract 36 from 40, 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 12:
When dividing 40 by 12, we get 3 with a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 1770164.5833
The remainder is 4 after subtracting 36 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The quotient of the division is 1770164.5833, and the remainder is 4e-05.