A:
Positive:
1 x 2121736111 x 192885131 x 68443143 x 493427341 x 62221473 x 448571333 x 159171447 x 14663
Negative:
-1 x -21217361-11 x -1928851-31 x -684431-43 x -493427-341 x -62221-473 x -44857-1333 x -15917-1447 x -14663
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 21,217,361, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 21,217,361 | |
| -1 | -21,217,361 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,217,361.
Example:
1 x 21,217,361 = 21,217,361
and
-1 x -21,217,361 = 21,217,361
Notice both answers equal 21,217,361
With that explanation out of the way, let's continue. Next, we take the number 21,217,361 and divide it by 2:
21,217,361 ÷ 2 = 10,608,680.5
If the quotient is a whole number, then 2 and 10,608,680.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,217,361 | |
| -1 | -21,217,361 |
Now, we try dividing 21,217,361 by 3:
21,217,361 ÷ 3 = 7,072,453.6667
If the quotient is a whole number, then 3 and 7,072,453.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,217,361 | |
| -1 | -21,217,361 |
Let's try dividing by 4:
21,217,361 ÷ 4 = 5,304,340.25
If the quotient is a whole number, then 4 and 5,304,340.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 21,217,361 | |
| -1 | 21,217,361 |
If you did it right, you will end up with this table:
| 1 | 11 | 31 | 43 | 341 | 473 | 1,333 | 1,447 | 14,663 | 15,917 | 44,857 | 62,221 | 493,427 | 684,431 | 1,928,851 | 21,217,361 |
| -1 | -11 | -31 | -43 | -341 | -473 | -1,333 | -1,447 | -14,663 | -15,917 | -44,857 | -62,221 | -493,427 | -684,431 | -1,928,851 | -21,217,361 |
Here are some more numbers to try:
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