120
120 is an integer. Integers aren't fractions or mixed numbers. You can write 120 as 120/1 or 119 and 4/4, but it wouldn't be in simplest form. The simplest form of any integer is the integer itself.
It depends what calculation you are doing.
which is 1.456 billon?
The prime numbers (factors) of 120 are: 2,3,5
12,000,000,000
1,000,000,000
10,000,000,000
1276
17,000,000,000
10,000,000,000
one billon
120
there are 9 zeros in a millon
4,000,000,000
900,000,000,000,000 (UK) or 900,000,000,000 (USA)
2,700,000,000 or 2.7 × 109