165134021 has 8 divisors (see below), whose sum is σ = 177942240. Its totient is φ = 152340912.

The previous prime is 165134017. The next prime is 165134023. The reversal of 165134021 is 120431561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165134021 - 2² = 165134017 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 (165134023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30506 + ... + 35508.

It is an arithmetic number, because the mean of its divisors is an integer number (22242780).

Almost surely, 2^165134021 is an apocalyptic number.

It is an amenable number.

165134021 is a deficient number, since it is larger than the sum of its proper divisors (12808219).

165134021 is a wasteful number, since it uses less digits than its factorization.

165134021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7555.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 165134021 is about 12850.4482801185. The cubic root of 165134021 is about 548.6291159153.

Adding to 165134021 its reverse (120431561), we get a palindrome (285565582).

The spelling of 165134021 in words is "one hundred sixty-five million, one hundred thirty-four thousand, twenty-one".