21551946 ÷ 243 
We're looking to find how many times 243 goes into 21551946.

Moving on to step 1:
243 can be fit into 2 0 times, resulting in a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 243

Step 2:
If we divide 21 by 243, we get 0 and a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Append the next digit (5) from the dividend to 21 and continue with: 215 / 243

Moving on to step 3:
243 can be fit into 215 0 times, resulting in a remainder of 215.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 215 to get 215.
Include the next digit (5) from the dividend after 215, then repeat: 2155 / 243

Moving on to step 4:
If we divide 2155 by 243, we get 8 and a remainder of 211.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtracting 1944 from 2155 leaves us with 211.
Include the next digit (1) from the dividend after 211, then repeat: 2111 / 243

Moving on to step 5:
If we divide 2111 by 243, we get 8 and a remainder of 167.
The next digit of our result is 8. 
Result so far: 88.0
Subtract 1944 from 2111 to get 167.
Grab the next digit (9) from the dividend, add it to 167, then carry on: 1679 / 243

On to step 6:
The number 243 fits into 1679 6 times, leaving a remainder of 221.
Write down 6 as next digit of the result. 
Result so far: 886.0
Deduct 1458 from 1679 and we're left with 221.
Include the next digit (4) from the dividend after 221, then repeat: 2214 / 243

Moving on to step 7:
2214 divided by 243 is 9 with a remainder of 27.
Record the quotient 9 as the next digit in the result. 
Result so far: 8869.0
If we take 2187 away from 2214, we end up with 27.
Fetch the next digit (6) from the dividend, attach it to 27 and continue: 276 / 243

Moving on to step 8:
If we divide 276 by 243, we get 1 and a remainder of 33.
Write down 1 as next digit of the result. 
Result so far: 88691.0
Deduct 243 from 276 and we're left with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Advancing to step 9:
243 goes into 330 1 times with a remainder of 87.
The next digit of our result is 1. 
Result so far: 88691.1
Subtract 243 from 330 to get 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Advancing to step 10:
The number 243 fits into 870 3 times, leaving a remainder of 141.
Use 3 as the next digit of our solution. 
Result so far: 88691.13
If we subtract 729 from 870, we get 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1410, and continue the process.

Going ahead to step 11:
1410 divided by 243 is 5 with a remainder of 195.
Record the quotient 5 as the next digit in the result. 
Result so far: 88691.135
Deduct 1215 from 1410 and we're left with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Going ahead to step 12:
If we divide 1950 by 243, we get 8 and a remainder of 6.
Write down 8 as next digit of the result. 
Result so far: 88691.1358
Subtracting 1944 from 1950 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.

Going ahead to step 13:
If we divide 60 by 243, we get 0 and a remainder of 60.
The next digit of our result is 0. 
Result so far: 88691.1358
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 14:
The number 243 fits into 600 2 times, leaving a remainder of 114.
Put 2 as the next digit of the answer. 
Result so far: 88691.135802
The remainder is 114 after subtracting 486 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

On to step 15:
243 goes into 1140 4 times with a remainder of 168.
Put 4 as the next digit of the answer. 
Result so far: 88691.1358024
The remainder is 168 after subtracting 972 from 1140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

On to step 16:
1680 divided by 243 is 6 with a remainder of 222.
Put 6 as the next digit of the answer. 
Result so far: 88691.13580246
Deduct 1458 from 1680 and we're left with 222.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2220, and continue the process.

The final result is 88691.13580246 with a remainder of 2.22e-07.