16265021 has 4 divisors (see below), whose sum is σ = 16279200. Its totient is φ = 16250844.

The previous prime is 16264999. The next prime is 16265023. The reversal of 16265021 is 12056261.

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: 12056261 = 7 ⋅1722323.

It is a cyclic number.

It is not a de Polignac number, because 16265021 - 2¹⁰ = 16263997 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 (16265023) 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, 5201 + ... + 7718.

It is an arithmetic number, because the mean of its divisors is an integer number (4069800).

Almost surely, 2^16265021 is an apocalyptic number.

It is an amenable number.

16265021 is a deficient number, since it is larger than the sum of its proper divisors (14179).

16265021 is a wasteful number, since it uses less digits than its factorization.

16265021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14178.

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

The square root of 16265021 is about 4032.9915695424. The cubic root of 16265021 is about 253.3678713683.

The spelling of 16265021 in words is "sixteen million, two hundred sixty-five thousand, twenty-one".