16264421 has 4 divisors (see below), whose sum is σ = 16422432. Its totient is φ = 16106412.

The previous prime is 16264403. The next prime is 16264433. The reversal of 16264421 is 12446261.

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: 12446261 = 17 ⋅732133.

It is a cyclic number.

It is not a de Polignac number, because 16264421 - 2⁶ = 16264357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16260421) 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 3 ways as a sum of consecutive naturals, for example, 78851 + ... + 79056.

It is an arithmetic number, because the mean of its divisors is an integer number (4105608).

Almost surely, 2^16264421 is an apocalyptic number.

It is an amenable number.

16264421 is a deficient number, since it is larger than the sum of its proper divisors (158011).

16264421 is a wasteful number, since it uses less digits than its factorization.

16264421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158010.

The product of its digits is 2304, while the sum is 26.

The square root of 16264421 is about 4032.9171823880. The cubic root of 16264421 is about 253.3647558361.

The spelling of 16264421 in words is "sixteen million, two hundred sixty-four thousand, four hundred twenty-one".