23813921 has 4 divisors (see below), whose sum is σ = 24582144. Its totient is φ = 23045700.

The previous prime is 23813899. The next prime is 23813927. The reversal of 23813921 is 12931832.

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 23813921 - 2⁶ = 23813857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23813927) 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, 384065 + ... + 384126.

It is an arithmetic number, because the mean of its divisors is an integer number (6145536).

Almost surely, 2^23813921 is an apocalyptic number.

It is an amenable number.

23813921 is a deficient number, since it is larger than the sum of its proper divisors (768223).

23813921 is an equidigital number, since it uses as much as digits as its factorization.

23813921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768222.

The product of its digits is 2592, while the sum is 29.

The square root of 23813921 is about 4879.9509218844. The cubic root of 23813921 is about 287.7025003098.

The spelling of 23813921 in words is "twenty-three million, eight hundred thirteen thousand, nine hundred twenty-one".