We're dividing 16621472 by 420 
We're looking to find how many times 420 goes into 16621472.

On to step 1:
When dividing 1 by 420, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 420

Moving on to step 2:
420 can be fit into 16 0 times, resulting in a remainder of 16.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 16 and we're left with 16.
Include the next digit (6) from the dividend after 16, then repeat: 166 / 420

Moving on to step 3:
The number 420 fits into 166 0 times, leaving a remainder of 166.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 166 after subtracting 0 from 166.
Fetch the next digit (2) from the dividend, attach it to 166 and continue: 1662 / 420

Moving on to step 4:
420 can be fit into 1662 3 times, resulting in a remainder of 402.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 1260 from 1662 and we're left with 402.
Bring next digit (1) of the dividend behind the 402 and repeat the process: 4021 / 420

Step 5:
4021 divided by 420 is 9 with a remainder of 241.
Write down 9 as next digit of the result. 
Result so far: 39.0
If we take 3780 away from 4021, we end up with 241.
Grab the next digit (4) from the dividend, add it to 241, then carry on: 2414 / 420

Going ahead to step 6:
420 goes into 2414 5 times with a remainder of 314.
Record the quotient 5 as the next digit in the result. 
Result so far: 395.0
Deduct 2100 from 2414 and we're left with 314.
Include the next digit (7) from the dividend after 314, then repeat: 3147 / 420

Step 7:
The number 420 fits into 3147 7 times, leaving a remainder of 207.
Record the quotient 7 as the next digit in the result. 
Result so far: 3957.0
If we take 2940 away from 3147, we end up with 207.
Fetch the next digit (2) from the dividend, attach it to 207 and continue: 2072 / 420

Step 8:
420 can be fit into 2072 4 times, resulting in a remainder of 392.
Write down 4 as next digit of the result. 
Result so far: 39574.0
If we subtract 1680 from 2072, we get 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

On to step 9:
420 goes into 3920 9 times with a remainder of 140.
The next digit of our result is 9. 
Result so far: 39574.9
Subtracting 3780 from 3920 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Moving on to step 10:
420 can be fit into 1400 3 times, resulting in a remainder of 140.
Record the quotient 3 as the next digit in the result. 
Result so far: 39574.93
Deduct 1260 from 1400 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Moving on to step 11:
1400 divided by 420 is 3 with a remainder of 140.
Write down 3 as next digit of the result. 
Result so far: 39574.933
The remainder is 140 after subtracting 1260 from 1400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

The final result is 39574.933 with a remainder of 0.014.