Let's divide 70170021 by 4
Let's see how many times 4 fits into 70170021.

Advancing to step 1:
If we divide 7 by 4, we get 1 and a remainder of 3.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 4 from 7, we get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 4

Going ahead to step 2:
4 can be fit into 30 7 times, resulting in a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 17.0
Subtract 28 from 30 to get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 4

Moving on to step 3:
If we divide 21 by 4, we get 5 and a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 175.0
Subtract 20 from 21 to get 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 4

Let's proceed to step 4:
4 goes into 17 4 times with a remainder of 1.
The next digit of our result is 4. 
Result so far: 1754.0
Subtracting 16 from 17 leaves us with 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 4

Step 5:
10 divided by 4 is 2 with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 17542.0
Deduct 8 from 10 and we're left with 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 4

Going ahead to step 6:
4 goes into 20 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 175425.0
If we take 20 away from 20, we end up with 0.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 4

Going ahead to step 7:
The number 4 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 1754250.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 4

Going ahead to step 8:
4 can be fit into 21 5 times, resulting in a remainder of 1.
Put 5 as the next digit of the answer. 
Result so far: 17542505.0
Subtract 20 from 21 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 9:
4 goes into 10 2 times with a remainder of 2.
The next digit of our result is 2. 
Result so far: 17542505.2
Subtracting 8 from 10 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
When dividing 20 by 4, we get 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 17542505.25
Subtracting 20 from 20 leaves us 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.

Let's proceed to step 11:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 17542505.25
If we take 0 away from 0, we end up 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.

Let's proceed to step 12:
If we divide 0 by 4, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 17542505.25
If we subtract 0 from 0, we 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.

The final outcome is 17542505.25, with a leftover of 0.0.