16421165 has 8 divisors (see below), whose sum is σ = 20341248. Its totient is φ = 12713040.

The previous prime is 16421161. The next prime is 16421179. The reversal of 16421165 is 56112461.

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

It is not a de Polignac number, because 16421165 - 2² = 16421161 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 (16421161) 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 7 ways as a sum of consecutive naturals, for example, 52817 + ... + 53126.

It is an arithmetic number, because the mean of its divisors is an integer number (2542656).

Almost surely, 2^16421165 is an apocalyptic number.

It is an amenable number.

16421165 is a deficient number, since it is larger than the sum of its proper divisors (3920083).

16421165 is a wasteful number, since it uses less digits than its factorization.

16421165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105979.

The product of its digits is 1440, while the sum is 26.

The square root of 16421165 is about 4052.3036658178. The cubic root of 16421165 is about 254.1760667789.

The spelling of 16421165 in words is "sixteen million, four hundred twenty-one thousand, one hundred sixty-five".