21691632 divided by 409 
Let's see how many times 409 fits into 21691632.

Advancing to step 1:
409 can be fit into 2 0 times, resulting in a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 409

Step 2:
409 can be fit into 21 0 times, resulting in a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Take the next digit (6) from the dividend and append it to 21, then repeat: 216 / 409

Let's proceed to step 3:
409 can be fit into 216 0 times, resulting in a remainder of 216.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 216, we end up with 216.
Take the next digit (9) from the dividend and append it to 216, then repeat: 2169 / 409

Step 4:
409 goes into 2169 5 times with a remainder of 124.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we subtract 2045 from 2169, we get 124.
Include the next digit (1) from the dividend after 124, then repeat: 1241 / 409

On to step 5:
1241 divided by 409 is 3 with a remainder of 14.
The number 3 becomes the next digit in our result. 
Result so far: 53.0
Subtracting 1227 from 1241 leaves us with 14.
Append the next digit (6) from the dividend to 14 and continue with: 146 / 409

Going ahead to step 6:
146 divided by 409 is 0 with a remainder of 146.
The next digit of our result is 0. 
Result so far: 530.0
If we take 0 away from 146, we end up with 146.
Take the next digit (3) from the dividend and append it to 146, then repeat: 1463 / 409

Advancing to step 7:
1463 divided by 409 is 3 with a remainder of 236.
The number 3 becomes the next digit in our result. 
Result so far: 5303.0
Subtracting 1227 from 1463 leaves us with 236.
Grab the next digit (2) from the dividend, add it to 236, then carry on: 2362 / 409

Let's proceed to step 8:
If we divide 2362 by 409, we get 5 and a remainder of 317.
Use 5 as the next digit of our solution. 
Result so far: 53035.0
Subtracting 2045 from 2362 leaves us with 317.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3170, and continue the process.

Let's proceed to step 9:
If we divide 3170 by 409, we get 7 and a remainder of 307.
The number 7 becomes the next digit in our result. 
Result so far: 53035.7
If we subtract 2863 from 3170, we get 307.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3070, and continue the process.

Moving on to step 10:
The number 409 fits into 3070 7 times, leaving a remainder of 207.
The number 7 becomes the next digit in our result. 
Result so far: 53035.77
If we take 2863 away from 3070, we end up with 207.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2070, and continue the process.

In conclusion, the division gives 53035.77 with a balance of 0.207.