239154021 has 24 divisors (see below), whose sum is σ = 352539200. Its totient is φ = 156188736.

The previous prime is 239154017. The next prime is 239154031. The reversal of 239154021 is 120451932.

It is not a de Polignac number, because 239154021 - 2² = 239154017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239154031) 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 23 ways as a sum of consecutive naturals, for example, 119001 + ... + 120993.

Almost surely, 2^239154021 is an apocalyptic number.

It is an amenable number.

239154021 is a deficient number, since it is larger than the sum of its proper divisors (113385179).

239154021 is a wasteful number, since it uses less digits than its factorization.

239154021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2265 (or 2262 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 239154021 is about 15464.6054265862. The cubic root of 239154021 is about 620.7154600514.

The spelling of 239154021 in words is "two hundred thirty-nine million, one hundred fifty-four thousand, twenty-one".