367455 ÷ 21 
We want to figure out the number of times 367455 can be divided by 21.

Going ahead to step 1:
3 divided by 21 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Append the next digit (6) from the dividend to 3 and continue with: 36 / 21

Step 2:
The number 21 fits into 36 1 times, leaving a remainder of 15.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 21 away from 36, we end up with 15.
Bring next digit (7) of the dividend behind the 15 and repeat the process: 157 / 21

Moving on to step 3:
21 goes into 157 7 times with a remainder of 10.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
If we take 147 away from 157, we end up with 10.
Fetch the next digit (4) from the dividend, attach it to 10 and continue: 104 / 21

Advancing to step 4:
When dividing 104 by 21, we get 4 with a remainder of 20.
The next digit of our result is 4. 
Result so far: 174.0
If we subtract 84 from 104, we get 20.
Take the next digit (5) from the dividend and append it to 20, then repeat: 205 / 21

Advancing to step 5:
205 divided by 21 is 9 with a remainder of 16.
The number 9 becomes the next digit in our result. 
Result so far: 1749.0
If we take 189 away from 205, we end up with 16.
Grab the next digit (5) from the dividend, add it to 16, then carry on: 165 / 21

Moving on to step 6:
165 divided by 21 is 7 with a remainder of 18.
Put 7 as the next digit of the answer. 
Result so far: 17497.0
Subtract 147 from 165 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 7:
If we divide 180 by 21, we get 8 and a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 17497.8
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 8:
If we divide 120 by 21, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 17497.85
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 9:
21 goes into 150 7 times with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 17497.857
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 10:
30 divided by 21 is 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 17497.8571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 11:
21 goes into 90 4 times with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 17497.85714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 12:
60 divided by 21 is 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 17497.857142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 13:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 17497.8571428
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 14:
If we divide 120 by 21, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 17497.85714285
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final outcome is 17497.85714285, with a leftover of 1.5e-08.