23116521 has 8 divisors (see below), whose sum is σ = 32444320. Its totient is φ = 14599872.

The previous prime is 23116519. The next prime is 23116529. The reversal of 23116521 is 12561132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23116521 - 2¹ = 23116519 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23116529) 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 7 ways as a sum of consecutive naturals, for example, 202720 + ... + 202833.

It is an arithmetic number, because the mean of its divisors is an integer number (4055540).

Almost surely, 2^23116521 is an apocalyptic number.

It is an amenable number.

23116521 is a deficient number, since it is larger than the sum of its proper divisors (9327799).

23116521 is a wasteful number, since it uses less digits than its factorization.

23116521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405575.

The product of its digits is 360, while the sum is 21.

The square root of 23116521 is about 4807.9643301505. The cubic root of 23116521 is about 284.8661359645.

Adding to 23116521 its reverse (12561132), we get a palindrome (35677653).

The spelling of 23116521 in words is "twenty-three million, one hundred sixteen thousand, five hundred twenty-one".