We divide 21561642 by 406
We're looking to find how many times 406 goes into 21561642.

On to step 1:
If we divide 2 by 406, we get 0 and 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.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 406

Moving on to step 2:
21 divided by 406 is 0 with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Append the next digit (5) from the dividend to 21 and continue with: 215 / 406

Step 3:
The number 406 fits into 215 0 times, leaving a remainder of 215.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 215 and we're left with 215.
Take the next digit (6) from the dividend and append it to 215, then repeat: 2156 / 406

Let's proceed to step 4:
When dividing 2156 by 406, we get 5 with a remainder of 126.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we take 2030 away from 2156, we end up with 126.
Append the next digit (1) from the dividend to 126 and continue with: 1261 / 406

Step 5:
406 goes into 1261 3 times with a remainder of 43.
Write down 3 as next digit of the result. 
Result so far: 53.0
If we take 1218 away from 1261, we end up with 43.
Grab the next digit (6) from the dividend, add it to 43, then carry on: 436 / 406

Step 6:
406 can be fit into 436 1 times, resulting in a remainder of 30.
The number 1 becomes the next digit in our result. 
Result so far: 531.0
Deduct 406 from 436 and we're left with 30.
Append the next digit (4) from the dividend to 30 and continue with: 304 / 406

Let's proceed to step 7:
The number 406 fits into 304 0 times, leaving a remainder of 304.
The number 0 becomes the next digit in our result. 
Result so far: 5310.0
The remainder is 304 after subtracting 0 from 304.
Fetch the next digit (2) from the dividend, attach it to 304 and continue: 3042 / 406

Let's proceed to step 8:
406 goes into 3042 7 times with a remainder of 200.
Record the quotient 7 as the next digit in the result. 
Result so far: 53107.0
The remainder is 200 after subtracting 2842 from 3042.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Moving on to step 9:
406 goes into 2000 4 times with a remainder of 376.
The next digit of our result is 4. 
Result so far: 53107.4
If we subtract 1624 from 2000, we get 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Going ahead to step 10:
406 goes into 3760 9 times with a remainder of 106.
The number 9 becomes the next digit in our result. 
Result so far: 53107.49
Subtract 3654 from 3760 to get 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Step 11:
If we divide 1060 by 406, we get 2 and a remainder of 248.
Put 2 as the next digit of the answer. 
Result so far: 53107.492
If we subtract 812 from 1060, we get 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

On to step 12:
If we divide 2480 by 406, we get 6 and a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 53107.4926
If we subtract 2436 from 2480, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 13:
The number 406 fits into 440 1 times, leaving a remainder of 34.
Write down 1 as next digit of the result. 
Result so far: 53107.49261
If we subtract 406 from 440, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 14:
If we divide 340 by 406, we get 0 and a remainder of 340.
Write down 0 as next digit of the result. 
Result so far: 53107.49261
Deduct 0 from 340 and we're left with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Going ahead to step 15:
406 can be fit into 3400 8 times, resulting in a remainder of 152.
Put 8 as the next digit of the answer. 
Result so far: 53107.4926108
Deduct 3248 from 3400 and we're left with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

Step 16:
406 can be fit into 1520 3 times, resulting in a remainder of 302.
Use 3 as the next digit of our solution. 
Result so far: 53107.49261083
The remainder is 302 after subtracting 1218 from 1520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

The final outcome is 53107.49261083, with a leftover of 3.02e-07.