23312021 has 4 divisors (see below), whose sum is σ = 23707200. Its totient is φ = 22916844.

The previous prime is 23312017. The next prime is 23312053. The reversal of 23312021 is 12021332.

It is a happy number.

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 23312021 - 2² = 23312017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23311987 and 23312005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23312011) 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, 197501 + ... + 197618.

It is an arithmetic number, because the mean of its divisors is an integer number (5926800).

Almost surely, 2^23312021 is an apocalyptic number.

It is an amenable number.

23312021 is a deficient number, since it is larger than the sum of its proper divisors (395179).

23312021 is an equidigital number, since it uses as much as digits as its factorization.

23312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395178.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 23312021 is about 4828.2523753424. The cubic root of 23312021 is about 285.6669350460. Note that the first 3 decimals are identical.

Adding to 23312021 its reverse (12021332), we get a palindrome (35333353).

The spelling of 23312021 in words is "twenty-three million, three hundred twelve thousand, twenty-one".