23306521 has 24 divisors (see below), whose sum is σ = 29407104. Its totient is φ = 18057600.

The previous prime is 23306477. The next prime is 23306533. The reversal of 23306521 is 12560332.

It is not a de Polignac number, because 23306521 - 2¹¹ = 23304473 is a prime.

It is a super-2 number, since 2×23306521² = 1086387842246882, 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 = 23306492 and 23306501.

It is not an unprimeable number, because it can be changed into a prime (23306561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57921 + ... + 58321.

It is an arithmetic number, because the mean of its divisors is an integer number (1225296).

Almost surely, 2^23306521 is an apocalyptic number.

It is an amenable number.

23306521 is a deficient number, since it is larger than the sum of its proper divisors (6100583).

23306521 is a wasteful number, since it uses less digits than its factorization.

23306521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 23306521 is about 4827.6827774824. The cubic root of 23306521 is about 285.6444674999.

Adding to 23306521 its reverse (12560332), we get a palindrome (35866853).

The spelling of 23306521 in words is "twenty-three million, three hundred six thousand, five hundred twenty-one".