23058721 has 4 divisors (see below), whose sum is σ = 26352832. Its totient is φ = 19764612.

The previous prime is 23058701. The next prime is 23058773. The reversal of 23058721 is 12785032.

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.

It is not a de Polignac number, because 23058721 - 2⁵ = 23058689 is a prime.

It is a super-2 number, since 2×23058721² = 1063409228311682, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23058721.

It is not an unprimeable number, because it can be changed into a prime (23058701) 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, 1647045 + ... + 1647058.

It is an arithmetic number, because the mean of its divisors is an integer number (6588208).

Almost surely, 2^23058721 is an apocalyptic number.

It is an amenable number.

23058721 is a deficient number, since it is larger than the sum of its proper divisors (3294111).

23058721 is an equidigital number, since it uses as much as digits as its factorization.

23058721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3294110.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 23058721 is about 4801.9497081915. The cubic root of 23058721 is about 284.6285136327.

It can be divided in two parts, 2305 and 8721, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 23058721 in words is "twenty-three million, fifty-eight thousand, seven hundred twenty-one".