We look at the division of 21212046 by 66 
We want to figure out the number of times 21212046 can be divided by 66.

Going ahead to step 1:
66 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 66

Let's proceed to step 2:
The number 66 fits into 21 0 times, leaving a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Grab the next digit (2) from the dividend, add it to 21, then carry on: 212 / 66

On to step 3:
When dividing 212 by 66, we get 3 with a remainder of 14.
The next digit of our result is 3. 
Result so far: 3.0
If we take 198 away from 212, we end up with 14.
Grab the next digit (1) from the dividend, add it to 14, then carry on: 141 / 66

Step 4:
If we divide 141 by 66, we get 2 and a remainder of 9.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
Deduct 132 from 141 and we're left with 9.
Grab the next digit (2) from the dividend, add it to 9, then carry on: 92 / 66

Let's proceed to step 5:
If we divide 92 by 66, we get 1 and a remainder of 26.
Put 1 as the next digit of the answer. 
Result so far: 321.0
Deduct 66 from 92 and we're left with 26.
Take the next digit (0) from the dividend and append it to 26, then repeat: 260 / 66

On to step 6:
260 divided by 66 is 3 with a remainder of 62.
Use 3 as the next digit of our solution. 
Result so far: 3213.0
If we take 198 away from 260, we end up with 62.
Grab the next digit (4) from the dividend, add it to 62, then carry on: 624 / 66

Advancing to step 7:
If we divide 624 by 66, we get 9 and a remainder of 30.
The number 9 becomes the next digit in our result. 
Result so far: 32139.0
If we subtract 594 from 624, we get 30.
Grab the next digit (6) from the dividend, add it to 30, then carry on: 306 / 66

Moving on to step 8:
If we divide 306 by 66, we get 4 and a remainder of 42.
The number 4 becomes the next digit in our result. 
Result so far: 321394.0
Subtracting 264 from 306 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 9:
66 can be fit into 420 6 times, resulting in a remainder of 24.
Record the quotient 6 as the next digit in the result. 
Result so far: 321394.6
The remainder is 24 after subtracting 396 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 10:
240 divided by 66 is 3 with a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 321394.63
Deduct 198 from 240 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 11:
The number 66 fits into 420 6 times, leaving a remainder of 24.
The number 6 becomes the next digit in our result. 
Result so far: 321394.636
Subtract 396 from 420 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 12:
240 divided by 66 is 3 with a remainder of 42.
The number 3 becomes the next digit in our result. 
Result so far: 321394.6363
If we subtract 198 from 240, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 13:
66 can be fit into 420 6 times, resulting in a remainder of 24.
Record the quotient 6 as the next digit in the result. 
Result so far: 321394.63636
Subtract 396 from 420 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 14:
240 divided by 66 is 3 with a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 321394.636363
Deduct 198 from 240 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 15:
If we divide 420 by 66, we get 6 and a remainder of 24.
The next digit of our result is 6. 
Result so far: 321394.6363636
The remainder is 24 after subtracting 396 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 16:
240 divided by 66 is 3 with a remainder of 42.
Write down 3 as next digit of the result. 
Result so far: 321394.63636363
If we take 198 away from 240, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

The final result is 321394.63636363 with a remainder of 4.2e-08.