21373465 has 16 divisors (see below), whose sum is σ = 26191872. Its totient is φ = 16740864.

The previous prime is 21373447. The next prime is 21373487. The reversal of 21373465 is 56437312.

It is a cyclic number.

It is not a de Polignac number, because 21373465 - 2⁷ = 21373337 is a prime.

It is a super-2 number, since 2×21373465² = 913650012212450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61422 + ... + 61768.

It is an arithmetic number, because the mean of its divisors is an integer number (1636992).

Almost surely, 2^21373465 is an apocalyptic number.

It is an amenable number.

21373465 is a deficient number, since it is larger than the sum of its proper divisors (4818407).

21373465 is a wasteful number, since it uses less digits than its factorization.

21373465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576.

The product of its digits is 15120, while the sum is 31.

The square root of 21373465 is about 4623.1444926586. The cubic root of 21373465 is about 277.5183116991.

The spelling of 21373465 in words is "twenty-one million, three hundred seventy-three thousand, four hundred sixty-five".