16165021 has 4 divisors (see below), whose sum is σ = 16867872. Its totient is φ = 15462172.

The previous prime is 16165001. The next prime is 16165031. The reversal of 16165021 is 12056161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12056161 = 13 ⋅927397.

It is a cyclic number.

It is not a de Polignac number, because 16165021 - 2⁹ = 16164509 is a prime.

It is a super-2 number, since 2×16165021² = 522615807860882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16164983 and 16165001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16165001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351391 + ... + 351436.

It is an arithmetic number, because the mean of its divisors is an integer number (4216968).

Almost surely, 2^16165021 is an apocalyptic number.

It is an amenable number.

16165021 is a deficient number, since it is larger than the sum of its proper divisors (702851).

16165021 is an equidigital number, since it uses as much as digits as its factorization.

16165021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702850.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 16165021 is about 4020.5747101627. The cubic root of 16165021 is about 252.8475545870.

The spelling of 16165021 in words is "sixteen million, one hundred sixty-five thousand, twenty-one".