31621059 ÷ 15 
Our goal is to divide 31621059 by 15.

Let's proceed to step 1:
The number 15 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 15

Step 2:
31 divided by 15 is 2 with a remainder of 1.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 30 from 31 to get 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 15

Let's proceed to step 3:
16 divided by 15 is 1 with a remainder of 1.
The next digit of our result is 1. 
Result so far: 21.0
Deduct 15 from 16 and we're left with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 15

Going ahead to step 4:
When dividing 12 by 15, we get 0 with a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 210.0
If we take 0 away from 12, we end up with 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 15

Advancing to step 5:
15 can be fit into 121 8 times, resulting in a remainder of 1.
Write down 8 as next digit of the result. 
Result so far: 2108.0
Deduct 120 from 121 and we're left with 1.
Append the next digit (0) from the dividend to 1 and continue with: 10 / 15

Going ahead to step 6:
If we divide 10 by 15, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 21080.0
If we subtract 0 from 10, we get 10.
Append the next digit (5) from the dividend to 10 and continue with: 105 / 15

Let's proceed to step 7:
If we divide 105 by 15, we get 7 and a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 210807.0
Deduct 105 from 105 and we're left with 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 15

Going ahead to step 8:
The number 15 fits into 9 0 times, leaving a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 2108070.0
If we subtract 0 from 9, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 9:
15 can be fit into 90 6 times, resulting in a remainder of 0.
Use 6 as the next digit of our solution. 
Result so far: 2108070.6
If we take 90 away from 90, 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.

Going ahead to step 10:
15 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 2108070.6
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.

Going ahead to step 11:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 2108070.6
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.

After the division, we end up with 2108070.6 and a remainder of 0.0.