89921627 ÷ 21 
We want to figure out the number of times 89921627 can be divided by 21.

Advancing to step 1:
21 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 21

Let's proceed to step 2:
If we divide 89 by 21, we get 4 and a remainder of 5.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 84 from 89 and we're left with 5.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 21

Going ahead to step 3:
If we divide 59 by 21, we get 2 and a remainder of 17.
The next digit of our result is 2. 
Result so far: 42.0
If we subtract 42 from 59, we get 17.
Include the next digit (2) from the dividend after 17, then repeat: 172 / 21

Let's proceed to step 4:
When dividing 172 by 21, we get 8 with a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 428.0
Deduct 168 from 172 and we're left with 4.
Grab the next digit (1) from the dividend, add it to 4, then carry on: 41 / 21

Going ahead to step 5:
When dividing 41 by 21, we get 1 with a remainder of 20.
The next digit of our result is 1. 
Result so far: 4281.0
If we take 21 away from 41, we end up with 20.
Bring next digit (6) of the dividend behind the 20 and repeat the process: 206 / 21

Let's proceed to step 6:
21 can be fit into 206 9 times, resulting in a remainder of 17.
Record the quotient 9 as the next digit in the result. 
Result so far: 42819.0
If we subtract 189 from 206, we get 17.
Include the next digit (2) from the dividend after 17, then repeat: 172 / 21

Advancing to step 7:
If we divide 172 by 21, we get 8 and a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 428198.0
If we take 168 away from 172, we end up with 4.
Take the next digit (7) from the dividend and append it to 4, then repeat: 47 / 21

Moving on to step 8:
47 divided by 21 is 2 with a remainder of 5.
Record the quotient 2 as the next digit in the result. 
Result so far: 4281982.0
Deduct 42 from 47 and we're left with 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 9:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 4281982.2
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.

Let's proceed to step 10:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 4281982.23
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.

Advancing to step 11:
The number 21 fits into 170 8 times, leaving a remainder of 2.
The next digit of our result is 8. 
Result so far: 4281982.238
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 12:
The number 21 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 4281982.238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 13:
200 divided by 21 is 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 4281982.23809
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 14:
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: 4281982.238095
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 15:
When dividing 50 by 21, we get 2 with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 4281982.2380952
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.

Step 16:
21 can be fit into 80 3 times, resulting in a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 4281982.23809523
If we take 63 away from 80, we end up 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 final outcome is 4281982.23809523, with a leftover of 1.7e-08.