We look at the division of 21414874 by 12 
We want to figure out the number of times 21414874 can be divided by 12.

Step 1:
12 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 12

Let's proceed to step 2:
The number 12 fits into 21 1 times, leaving a remainder of 9.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 12 from 21 and we're left with 9.
Take the next digit (4) from the dividend and append it to 9, then repeat: 94 / 12

Step 3:
12 can be fit into 94 7 times, resulting in a remainder of 10.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
The remainder is 10 after subtracting 84 from 94.
Bring next digit (1) of the dividend behind the 10 and repeat the process: 101 / 12

On to step 4:
The number 12 fits into 101 8 times, leaving a remainder of 5.
The number 8 becomes the next digit in our result. 
Result so far: 178.0
Subtracting 96 from 101 leaves us with 5.
Include the next digit (4) from the dividend after 5, then repeat: 54 / 12

Moving on to step 5:
12 goes into 54 4 times with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 1784.0
If we take 48 away from 54, we end up with 6.
Take the next digit (8) from the dividend and append it to 6, then repeat: 68 / 12

Let's proceed to step 6:
12 goes into 68 5 times with a remainder of 8.
The number 5 becomes the next digit in our result. 
Result so far: 17845.0
If we take 60 away from 68, we end up with 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 12

Let's proceed to step 7:
12 can be fit into 87 7 times, resulting in a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 178457.0
Subtracting 84 from 87 leaves us with 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 12

Let's proceed to step 8:
12 can be fit into 34 2 times, resulting in a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 1784572.0
If we take 24 away from 34, we end up 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.

Let's proceed to step 9:
100 divided by 12 is 8 with a remainder of 4.
The next digit of our result is 8. 
Result so far: 1784572.8
Subtracting 96 from 100 leaves us 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.

Going ahead to step 10:
40 divided by 12 is 3 with a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 1784572.83
Subtracting 36 from 40 leaves us 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:
The number 12 fits into 40 3 times, leaving a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 1784572.833
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.

After the division, we end up with 1784572.833 and a remainder of 0.0004.