Let's divide 478170 by 21
We're looking to find how many times 21 goes into 478170.

Advancing to step 1:
When dividing 4 by 21, we get 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (7) from the dividend after 4, then repeat: 47 / 21

Let's proceed to step 2:
When dividing 47 by 21, we get 2 with a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 42 from 47 to get 5.
Take the next digit (8) from the dividend and append it to 5, then repeat: 58 / 21

Going ahead to step 3:
The number 21 fits into 58 2 times, leaving a remainder of 16.
Write down 2 as next digit of the result. 
Result so far: 22.0
The remainder is 16 after subtracting 42 from 58.
Append the next digit (1) from the dividend to 16 and continue with: 161 / 21

Step 4:
The number 21 fits into 161 7 times, leaving a remainder of 14.
Record the quotient 7 as the next digit in the result. 
Result so far: 227.0
If we take 147 away from 161, we end up with 14.
Include the next digit (7) from the dividend after 14, then repeat: 147 / 21

Moving on to step 5:
147 divided by 21 is 7 with a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 2277.0
Deduct 147 from 147 and we're left with 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 21

Advancing to step 6:
0 divided by 21 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 22770.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
When dividing 0 by 21, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 22770.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
21 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 22770.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 22770.0 with a balance of 0.0.