What are the factors of 210?

There are infinitely many possible answers.

Let x be any number between 0 and sqrt(210) and let y = 210/x.

Then x*y = x*(210/x) = 210

since there are infinitely many possible values for x, there are infinitely many possible answers.

Next, there are infinitely many triplets, quartets and so on which can be multiplied to get 210.

The positive integer factors of 210 are 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, and 210

The factor pairs of 210 are (210,1), (105,2), (70,3), (42,5), (35,6), (30,7), (21,10), and (15,14)