148122 divided by 21 
We want to figure out the number of times 148122 can be divided by 21.

Step 1:
The number 21 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 21

Let's proceed to step 2:
The number 21 fits into 14 0 times, leaving a remainder of 14.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 14, we get 14.
Take the next digit (8) from the dividend and append it to 14, then repeat: 148 / 21

Moving on to step 3:
If we divide 148 by 21, we get 7 and a remainder of 1.
The next digit of our result is 7. 
Result so far: 7.0
Subtract 147 from 148 to get 1.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 21

On to step 4:
11 divided by 21 is 0 with a remainder of 11.
Record the quotient 0 as the next digit in the result. 
Result so far: 70.0
Subtract 0 from 11 to get 11.
Bring next digit (2) of the dividend behind the 11 and repeat the process: 112 / 21

On to step 5:
21 goes into 112 5 times with a remainder of 7.
The number 5 becomes the next digit in our result. 
Result so far: 705.0
If we subtract 105 from 112, we get 7.
Grab the next digit (2) from the dividend, add it to 7, then carry on: 72 / 21

Advancing to step 6:
When dividing 72 by 21, we get 3 with a remainder of 9.
The number 3 becomes the next digit in our result. 
Result so far: 7053.0
If we take 63 away from 72, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 7053.4
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 8:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 7053.42
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 9:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 7053.428
Subtract 168 from 180 to 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.

On to step 10:
If we divide 120 by 21, we get 5 and a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 7053.4285
Deduct 105 from 120 and we're left with 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 11:
The number 21 fits into 150 7 times, leaving a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 7053.42857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 12:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 7053.428571
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 13:
The number 21 fits into 90 4 times, leaving a remainder of 6.
The next digit of our result is 4. 
Result so far: 7053.4285714
Subtracting 84 from 90 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 14:
21 goes into 60 2 times with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 7053.42857142
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.

In conclusion, the division gives 7053.42857142 with a balance of 1.8e-08.