A:
Positive:
1 x 21018555 x 4203717 x 30026523 x 9138535 x 6005349 x 42895115 x 18277161 x 13055245 x 8579373 x 5635805 x 26111127 x 1865
Negative:
-1 x -2101855-5 x -420371-7 x -300265-23 x -91385-35 x -60053-49 x -42895-115 x -18277-161 x -13055-245 x -8579-373 x -5635-805 x -2611-1127 x -1865
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 2,101,855, 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 | 2,101,855 | |
| -1 | -2,101,855 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 2,101,855.
Example:
1 x 2,101,855 = 2,101,855
and
-1 x -2,101,855 = 2,101,855
Notice both answers equal 2,101,855
With that explanation out of the way, let's continue. Next, we take the number 2,101,855 and divide it by 2:
2,101,855 ÷ 2 = 1,050,927.5
If the quotient is a whole number, then 2 and 1,050,927.5 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 | 2,101,855 | |
| -1 | -2,101,855 |
Now, we try dividing 2,101,855 by 3:
2,101,855 ÷ 3 = 700,618.3333
If the quotient is a whole number, then 3 and 700,618.3333 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 | 2,101,855 | |
| -1 | -2,101,855 |
Let's try dividing by 4:
2,101,855 ÷ 4 = 525,463.75
If the quotient is a whole number, then 4 and 525,463.75 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 | 2,101,855 | |
| -1 | 2,101,855 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 23 | 35 | 49 | 115 | 161 | 245 | 373 | 805 | 1,127 | 1,865 | 2,611 | 5,635 | 8,579 | 13,055 | 18,277 | 42,895 | 60,053 | 91,385 | 300,265 | 420,371 | 2,101,855 |
| -1 | -5 | -7 | -23 | -35 | -49 | -115 | -161 | -245 | -373 | -805 | -1,127 | -1,865 | -2,611 | -5,635 | -8,579 | -13,055 | -18,277 | -42,895 | -60,053 | -91,385 | -300,265 | -420,371 | -2,101,855 |
Here are some more numbers to try:
Try the factor calculator