23313221 has 4 divisors (see below), whose sum is σ = 23367744. Its totient is φ = 23258700.

The previous prime is 23313211. The next prime is 23313259. The reversal of 23313221 is 12231332.

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 a de Polignac number, because none of the positive numbers 2^k-23313221 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 23313221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23313211) 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, 26615 + ... + 27476.

It is an arithmetic number, because the mean of its divisors is an integer number (5841936).

Almost surely, 2^23313221 is an apocalyptic number.

It is an amenable number.

23313221 is a deficient number, since it is larger than the sum of its proper divisors (54523).

23313221 is an equidigital number, since it uses as much as digits as its factorization.

23313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54522.

The product of its digits is 216, while the sum is 17.

The square root of 23313221 is about 4828.3766423095. The cubic root of 23313221 is about 285.6718365864.

Adding to 23313221 its reverse (12231332), we get a palindrome (35544553).

The spelling of 23313221 in words is "twenty-three million, three hundred thirteen thousand, two hundred twenty-one".