451190 divided by 21 
Let's see how many times 21 fits into 451190.

Going ahead to step 1:
If we divide 4 by 21, we get 0 and a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Fetch the next digit (5) from the dividend, attach it to 4 and continue: 45 / 21

Moving on to step 2:
When dividing 45 by 21, we get 2 with a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 3 after subtracting 42 from 45.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 21

Step 3:
When dividing 31 by 21, we get 1 with a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 21.0
Subtracting 21 from 31 leaves us with 10.
Fetch the next digit (1) from the dividend, attach it to 10 and continue: 101 / 21

Moving on to step 4:
101 divided by 21 is 4 with a remainder of 17.
The next digit of our result is 4. 
Result so far: 214.0
If we take 84 away from 101, we end up with 17.
Bring next digit (9) of the dividend behind the 17 and repeat the process: 179 / 21

Step 5:
21 goes into 179 8 times with a remainder of 11.
The number 8 becomes the next digit in our result. 
Result so far: 2148.0
Subtracting 168 from 179 leaves us with 11.
Grab the next digit (0) from the dividend, add it to 11, then carry on: 110 / 21

On to step 6:
110 divided by 21 is 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 21485.0
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 7:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 21485.2
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 8:
If we divide 80 by 21, we get 3 and a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 21485.23
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 9:
If we divide 170 by 21, we get 8 and a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 21485.238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 10:
21 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 21485.238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 11:
21 goes into 200 9 times with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 21485.23809
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 12:
If we divide 110 by 21, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 21485.238095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 13:
21 goes into 50 2 times with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 21485.2380952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 14:
21 goes into 80 3 times with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 21485.23809523
Subtracting 63 from 80 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The quotient of the division is 21485.23809523, and the remainder is 1.7e-08.