120921289 has 16 divisors (see below), whose sum is σ = 132656832. Its totient is φ = 109767168.

The previous prime is 120921223. The next prime is 120921293. The reversal of 120921289 is 982129021.

It is a de Polignac number, because none of the positive numbers 2^k-120921289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120921299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59677 + ... + 61669.

It is an arithmetic number, because the mean of its divisors is an integer number (8291052).

Almost surely, 2^120921289 is an apocalyptic number.

It is an amenable number.

120921289 is a deficient number, since it is larger than the sum of its proper divisors (11735543).

120921289 is a wasteful number, since it uses less digits than its factorization.

120921289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 120921289 is about 10996.4216452444. The cubic root of 120921289 is about 494.5014727173.

The spelling of 120921289 in words is "one hundred twenty million, nine hundred twenty-one thousand, two hundred eighty-nine".