We look at the division of 212131 by 20 
We want to figure out the number of times 212131 can be divided by 20.

Going ahead to step 1:
2 divided by 20 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 20

Going ahead to step 2:
When dividing 21 by 20, we get 1 with a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 20 from 21 to get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 20

Advancing to step 3:
When dividing 12 by 20, we get 0 with a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 10.0
If we take 0 away from 12, we end up with 12.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 20

Let's proceed to step 4:
121 divided by 20 is 6 with a remainder of 1.
Use 6 as the next digit of our solution. 
Result so far: 106.0
Subtract 120 from 121 to get 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 20

Going ahead to step 5:
If we divide 13 by 20, we get 0 and a remainder of 13.
Use 0 as the next digit of our solution. 
Result so far: 1060.0
Subtracting 0 from 13 leaves us with 13.
Grab the next digit (1) from the dividend, add it to 13, then carry on: 131 / 20

Moving on to step 6:
20 goes into 131 6 times with a remainder of 11.
The next digit of our result is 6. 
Result so far: 10606.0
Subtract 120 from 131 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 7:
20 can be fit into 110 5 times, resulting in a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 10606.5
If we take 100 away from 110, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
When dividing 100 by 20, we get 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 10606.55
Subtracting 100 from 100 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.

After the division, we end up with 10606.55 and a remainder of 0.0.