23319721 has 4 divisors (see below), whose sum is σ = 23380992. Its totient is φ = 23258452.

The previous prime is 23319701. The next prime is 23319727. The reversal of 23319721 is 12791332.

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 23319721 - 2⁵ = 23319689 is a prime.

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 23319721.

It is not an unprimeable number, because it can be changed into a prime (23319727) 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 3 ways as a sum of consecutive naturals, for example, 30061 + ... + 30826.

It is an arithmetic number, because the mean of its divisors is an integer number (5845248).

Almost surely, 2^23319721 is an apocalyptic number.

It is an amenable number.

23319721 is a deficient number, since it is larger than the sum of its proper divisors (61271).

23319721 is an equidigital number, since it uses as much as digits as its factorization.

23319721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61270.

The product of its digits is 2268, while the sum is 28.

The square root of 23319721 is about 4829.0496994750. The cubic root of 23319721 is about 285.6983836745.

The spelling of 23319721 in words is "twenty-three million, three hundred nineteen thousand, seven hundred twenty-one".