21552426 ÷ 406 
We want to figure out the number of times 21552426 can be divided by 406.

Let's proceed to step 1:
The number 406 fits into 2 0 times, leaving 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.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 406

On to step 2:
406 can be fit into 21 0 times, resulting in a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Include the next digit (5) from the dividend after 21, then repeat: 215 / 406

Going ahead to step 3:
406 goes into 215 0 times with a remainder of 215.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 215, we get 215.
Append the next digit (5) from the dividend to 215 and continue with: 2155 / 406

Advancing to step 4:
406 can be fit into 2155 5 times, resulting in a remainder of 125.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtract 2030 from 2155 to get 125.
Bring next digit (2) of the dividend behind the 125 and repeat the process: 1252 / 406

Going ahead to step 5:
The number 406 fits into 1252 3 times, leaving a remainder of 34.
The number 3 becomes the next digit in our result. 
Result so far: 53.0
Deduct 1218 from 1252 and we're left with 34.
Append the next digit (4) from the dividend to 34 and continue with: 344 / 406

On to step 6:
406 goes into 344 0 times with a remainder of 344.
Write down 0 as next digit of the result. 
Result so far: 530.0
If we subtract 0 from 344, we get 344.
Append the next digit (2) from the dividend to 344 and continue with: 3442 / 406

On to step 7:
The number 406 fits into 3442 8 times, leaving a remainder of 194.
Put 8 as the next digit of the answer. 
Result so far: 5308.0
Subtract 3248 from 3442 to get 194.
Bring next digit (6) of the dividend behind the 194 and repeat the process: 1946 / 406

Step 8:
The number 406 fits into 1946 4 times, leaving a remainder of 322.
The number 4 becomes the next digit in our result. 
Result so far: 53084.0
If we take 1624 away from 1946, we end up with 322.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3220, and continue the process.

Let's proceed to step 9:
If we divide 3220 by 406, we get 7 and a remainder of 378.
Put 7 as the next digit of the answer. 
Result so far: 53084.7
Deduct 2842 from 3220 and we're left with 378.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3780, and continue the process.

Going ahead to step 10:
406 goes into 3780 9 times with a remainder of 126.
Write down 9 as next digit of the result. 
Result so far: 53084.79
Subtracting 3654 from 3780 leaves us with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

On to step 11:
406 can be fit into 1260 3 times, resulting in a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 53084.793
If we subtract 1218 from 1260, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 12:
If we divide 420 by 406, we get 1 and a remainder of 14.
Use 1 as the next digit of our solution. 
Result so far: 53084.7931
The remainder is 14 after subtracting 406 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 13:
When dividing 140 by 406, we get 0 with a remainder of 140.
Use 0 as the next digit of our solution. 
Result so far: 53084.7931
If we subtract 0 from 140, we get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

On to step 14:
If we divide 1400 by 406, we get 3 and a remainder of 182.
Record the quotient 3 as the next digit in the result. 
Result so far: 53084.793103
The remainder is 182 after subtracting 1218 from 1400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

Advancing to step 15:
406 can be fit into 1820 4 times, resulting in a remainder of 196.
Use 4 as the next digit of our solution. 
Result so far: 53084.7931034
If we take 1624 away from 1820, we end up with 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Let's proceed to step 16:
When dividing 1960 by 406, we get 4 with a remainder of 336.
Use 4 as the next digit of our solution. 
Result so far: 53084.79310344
The remainder is 336 after subtracting 1624 from 1960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

In conclusion, the division gives 53084.79310344 with a balance of 3.36e-07.