165012321 has 32 divisors (see below), whose sum is σ = 237888000. Its totient is φ = 101426688.

The previous prime is 165012317. The next prime is 165012377. The reversal of 165012321 is 123210561.

It is not a de Polignac number, because 165012321 - 2² = 165012317 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (165012301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 467281 + ... + 467633.

It is an arithmetic number, because the mean of its divisors is an integer number (7434000).

Almost surely, 2^165012321 is an apocalyptic number.

It is an amenable number.

165012321 is a deficient number, since it is larger than the sum of its proper divisors (72875679).

165012321 is a wasteful number, since it uses less digits than its factorization.

165012321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 165012321 is about 12845.7121639869. The cubic root of 165012321 is about 548.4943070856.

Adding to 165012321 its reverse (123210561), we get a palindrome (288222882).

The spelling of 165012321 in words is "one hundred sixty-five million, twelve thousand, three hundred twenty-one".