921448 ÷ 21 
We want to figure out the number of times 921448 can be divided by 21.

Going ahead to step 1:
9 divided by 21 is 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Take the next digit (2) from the dividend and append it to 9, then repeat: 92 / 21

Let's proceed to step 2:
When dividing 92 by 21, we get 4 with a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we subtract 84 from 92, we get 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 21

Let's proceed to step 3:
21 can be fit into 81 3 times, resulting in a remainder of 18.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
The remainder is 18 after subtracting 63 from 81.
Include the next digit (4) from the dividend after 18, then repeat: 184 / 21

Step 4:
When dividing 184 by 21, we get 8 with a remainder of 16.
The next digit of our result is 8. 
Result so far: 438.0
If we take 168 away from 184, we end up with 16.
Take the next digit (4) from the dividend and append it to 16, then repeat: 164 / 21

On to step 5:
21 goes into 164 7 times with a remainder of 17.
Record the quotient 7 as the next digit in the result. 
Result so far: 4387.0
Subtract 147 from 164 to get 17.
Grab the next digit (8) from the dividend, add it to 17, then carry on: 178 / 21

On to step 6:
21 can be fit into 178 8 times, resulting in a remainder of 10.
Put 8 as the next digit of the answer. 
Result so far: 43878.0
Subtract 168 from 178 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
21 can be fit into 100 4 times, resulting in a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 43878.4
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 8:
The number 21 fits into 160 7 times, leaving a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 43878.47
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 9:
130 divided by 21 is 6 with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 43878.476
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 10:
If we divide 40 by 21, we get 1 and a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 43878.4761
Subtracting 21 from 40 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 11:
190 divided by 21 is 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 43878.47619
If we take 189 away from 190, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 12:
10 divided by 21 is 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 43878.47619
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 13:
When dividing 100 by 21, we get 4 with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 43878.4761904
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 14:
The number 21 fits into 160 7 times, leaving a remainder of 13.
The next digit of our result is 7. 
Result so far: 43878.47619047
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final outcome is 43878.47619047, with a leftover of 1.3e-08.