21857451 ÷ 654 
Let's see how many times 654 fits into 21857451.

On to step 1:
654 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 654

Advancing to step 2:
When dividing 21 by 654, we get 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Take the next digit (8) from the dividend and append it to 21, then repeat: 218 / 654

Advancing to step 3:
654 goes into 218 0 times with a remainder of 218.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 218 and we're left with 218.
Bring next digit (5) of the dividend behind the 218 and repeat the process: 2185 / 654

Moving on to step 4:
654 can be fit into 2185 3 times, resulting in a remainder of 223.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 1962 away from 2185, we end up with 223.
Include the next digit (7) from the dividend after 223, then repeat: 2237 / 654

Let's proceed to step 5:
2237 divided by 654 is 3 with a remainder of 275.
Write down 3 as next digit of the result. 
Result so far: 33.0
Subtracting 1962 from 2237 leaves us with 275.
Grab the next digit (4) from the dividend, add it to 275, then carry on: 2754 / 654

Going ahead to step 6:
2754 divided by 654 is 4 with a remainder of 138.
Write down 4 as next digit of the result. 
Result so far: 334.0
If we take 2616 away from 2754, we end up with 138.
Append the next digit (5) from the dividend to 138 and continue with: 1385 / 654

Going ahead to step 7:
654 can be fit into 1385 2 times, resulting in a remainder of 77.
The number 2 becomes the next digit in our result. 
Result so far: 3342.0
The remainder is 77 after subtracting 1308 from 1385.
Grab the next digit (1) from the dividend, add it to 77, then carry on: 771 / 654

Going ahead to step 8:
The number 654 fits into 771 1 times, leaving a remainder of 117.
Write down 1 as next digit of the result. 
Result so far: 33421.0
Deduct 654 from 771 and we're left with 117.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1170, and continue the process.

Advancing to step 9:
654 can be fit into 1170 1 times, resulting in a remainder of 516.
Record the quotient 1 as the next digit in the result. 
Result so far: 33421.1
If we subtract 654 from 1170, we get 516.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5160, and continue the process.

Advancing to step 10:
When dividing 5160 by 654, we get 7 with a remainder of 582.
Put 7 as the next digit of the answer. 
Result so far: 33421.17
If we subtract 4578 from 5160, we get 582.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5820, and continue the process.

Advancing to step 11:
If we divide 5820 by 654, we get 8 and a remainder of 588.
Use 8 as the next digit of our solution. 
Result so far: 33421.178
If we subtract 5232 from 5820, we get 588.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5880, and continue the process.

Going ahead to step 12:
The number 654 fits into 5880 8 times, leaving a remainder of 648.
Write down 8 as next digit of the result. 
Result so far: 33421.1788
Subtracting 5232 from 5880 leaves us with 648.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6480, and continue the process.

The final outcome is 33421.1788, with a leftover of 0.00648.