120121989 has 36 divisors (see below), whose sum is σ = 179650368. Its totient is φ = 71329440.

The previous prime is 120121957. The next prime is 120121997. The reversal of 120121989 is 989121021.

It is not a de Polignac number, because 120121989 - 2⁵ = 120121957 is a prime.

It is a super-2 number, since 2×120121989² = 28858584482632242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120121789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1691824 + ... + 1691894.

It is an arithmetic number, because the mean of its divisors is an integer number (4990288).

Almost surely, 2^120121989 is an apocalyptic number.

It is an amenable number.

120121989 is a deficient number, since it is larger than the sum of its proper divisors (59528379).

120121989 is an equidigital number, since it uses as much as digits as its factorization.

120121989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 120121989 is about 10960.0177463360. The cubic root of 120121989 is about 493.4094975641.

The spelling of 120121989 in words is "one hundred twenty million, one hundred twenty-one thousand, nine hundred eighty-nine".