23158321 has 4 divisors (see below), whose sum is σ = 24377200. Its totient is φ = 21939444.

The previous prime is 23158319. The next prime is 23158351. The reversal of 23158321 is 12385132.

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 a cyclic number.

It is not a de Polignac number, because 23158321 - 2¹ = 23158319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23158351) 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, 609411 + ... + 609448.

It is an arithmetic number, because the mean of its divisors is an integer number (6094300).

Almost surely, 2^23158321 is an apocalyptic number.

It is an amenable number.

23158321 is a deficient number, since it is larger than the sum of its proper divisors (1218879).

23158321 is a wasteful number, since it uses less digits than its factorization.

23158321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218878.

The product of its digits is 1440, while the sum is 25.

The square root of 23158321 is about 4812.3093208978. The cubic root of 23158321 is about 285.0377337953.

The spelling of 23158321 in words is "twenty-three million, one hundred fifty-eight thousand, three hundred twenty-one".