122421 ÷ 86 
We want to figure out the number of times 122421 can be divided by 86.

Step 1:
When dividing 1 by 86, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 86

Going ahead to step 2:
When dividing 12 by 86, we get 0 with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Include the next digit (2) from the dividend after 12, then repeat: 122 / 86

Advancing to step 3:
122 divided by 86 is 1 with a remainder of 36.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 86 from 122, we get 36.
Bring next digit (4) of the dividend behind the 36 and repeat the process: 364 / 86

Let's proceed to step 4:
86 can be fit into 364 4 times, resulting in a remainder of 20.
The next digit of our result is 4. 
Result so far: 14.0
If we take 344 away from 364, we end up with 20.
Take the next digit (2) from the dividend and append it to 20, then repeat: 202 / 86

Advancing to step 5:
86 goes into 202 2 times with a remainder of 30.
The number 2 becomes the next digit in our result. 
Result so far: 142.0
Subtract 172 from 202 to get 30.
Grab the next digit (1) from the dividend, add it to 30, then carry on: 301 / 86

Advancing to step 6:
When dividing 301 by 86, we get 3 with a remainder of 43.
Put 3 as the next digit of the answer. 
Result so far: 1423.0
If we take 258 away from 301, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

On to step 7:
If we divide 430 by 86, we get 5 and a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 1423.5
The remainder is 0 after subtracting 430 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
86 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1423.5
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
86 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1423.5
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 1423.5, and the remainder is 0.0.