We're dividing 402131 by 1 
We're looking to find how many times 1 goes into 402131.

On to step 1:
4 divided by 1 is 4 with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 0 after subtracting 4 from 4.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 1

On to step 2:
When dividing 0 by 1, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 40.0
If we subtract 0 from 0, we get 0.
Append the next digit (2) from the dividend to 0 and continue with: 2 / 1

Step 3:
2 divided by 1 is 2 with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 402.0
If we subtract 2 from 2, we get 0.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 1

Going ahead to step 4:
When dividing 1 by 1, we get 1 with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 4021.0
Subtract 1 from 1 to get 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 1

On to step 5:
When dividing 3 by 1, we get 3 with a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 40213.0
Deduct 3 from 3 and we're left with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 1

Advancing to step 6:
If we divide 1 by 1, we get 1 and a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 402131.0
Subtracting 1 from 1 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 7:
1 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: 402131.0
Subtracting 0 from 0 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 8:
0 divided by 1 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 402131.0
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.

The final result is 402131.0 with a remainder of 0.0.