We're dividing 21391459 by 470 
Our goal is to divide 21391459 by 470.

Going ahead to step 1:
470 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 470

Advancing to step 2:
When dividing 21 by 470, we get 0 with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Grab the next digit (3) from the dividend, add it to 21, then carry on: 213 / 470

Going ahead to step 3:
The number 470 fits into 213 0 times, leaving a remainder of 213.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 213 to get 213.
Include the next digit (9) from the dividend after 213, then repeat: 2139 / 470

On to step 4:
When dividing 2139 by 470, we get 4 with a remainder of 259.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 259 after subtracting 1880 from 2139.
Bring next digit (1) of the dividend behind the 259 and repeat the process: 2591 / 470

Let's proceed to step 5:
470 can be fit into 2591 5 times, resulting in a remainder of 241.
The next digit of our result is 5. 
Result so far: 45.0
Subtract 2350 from 2591 to get 241.
Include the next digit (4) from the dividend after 241, then repeat: 2414 / 470

On to step 6:
2414 divided by 470 is 5 with a remainder of 64.
The number 5 becomes the next digit in our result. 
Result so far: 455.0
The remainder is 64 after subtracting 2350 from 2414.
Fetch the next digit (5) from the dividend, attach it to 64 and continue: 645 / 470

Going ahead to step 7:
The number 470 fits into 645 1 times, leaving a remainder of 175.
Record the quotient 1 as the next digit in the result. 
Result so far: 4551.0
If we take 470 away from 645, we end up with 175.
Include the next digit (9) from the dividend after 175, then repeat: 1759 / 470

Advancing to step 8:
The number 470 fits into 1759 3 times, leaving a remainder of 349.
Record the quotient 3 as the next digit in the result. 
Result so far: 45513.0
Deduct 1410 from 1759 and we're left with 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

Let's proceed to step 9:
When dividing 3490 by 470, we get 7 with a remainder of 200.
Use 7 as the next digit of our solution. 
Result so far: 45513.7
Subtract 3290 from 3490 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Let's proceed to step 10:
470 can be fit into 2000 4 times, resulting in a remainder of 120.
Put 4 as the next digit of the answer. 
Result so far: 45513.74
If we subtract 1880 from 2000, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Moving on to step 11:
470 can be fit into 1200 2 times, resulting in a remainder of 260.
The next digit of our result is 2. 
Result so far: 45513.742
Deduct 940 from 1200 and we're left with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Step 12:
When dividing 2600 by 470, we get 5 with a remainder of 250.
The number 5 becomes the next digit in our result. 
Result so far: 45513.7425
Subtract 2350 from 2600 to get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Step 13:
When dividing 2500 by 470, we get 5 with a remainder of 150.
The number 5 becomes the next digit in our result. 
Result so far: 45513.74255
Deduct 2350 from 2500 and we're left with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

After the division, we end up with 45513.74255 and a remainder of 0.00015.