120111021 has 12 divisors (see below), whose sum is σ = 173770272. Its totient is φ = 79946376.

The previous prime is 120111007. The next prime is 120111029.

It is a happy number.

120111021 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 120111021 - 2⁹ = 120110509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 120110994 and 120111012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120111029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4491 + ... + 16136.

It is an arithmetic number, because the mean of its divisors is an integer number (14480856).

Almost surely, 2^120111021 is an apocalyptic number.

It is an amenable number.

120111021 is a deficient number, since it is larger than the sum of its proper divisors (53659251).

120111021 is a wasteful number, since it uses less digits than its factorization.

120111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21280 (or 21277 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 120111021 is about 10959.5173707604. The cubic root of 120111021 is about 493.3944798306.

The spelling of 120111021 in words is "one hundred twenty million, one hundred eleven thousand, twenty-one".