49
97 is the largest prime number below 100.
The prime factors of 100 are 2 and 5; the largest of these is 5. The largest prime number under 100 is 97.
The maximum number of different factors is 12 and there are 5 numbers in 1-100 which have 12 factors.
It is: 97
It is 97 and its factors are itself and one
21
97 and 4
60, 72, 84, 90 and 96 each have 12 factors.
99 =3*3*11
45, 63, 75 and 99 all have 6.
The largest composite integer before 100 is 99 - its positive integer factors are 1, 3, 9, 11, 33, 99.
I'm not too sure but i think that 1 and 10 are both factors. 100 as well.