23312321021 has 4 divisors (see below), whose sum is σ = 25431622944. Its totient is φ = 21193019100.

The previous prime is 23312320991. The next prime is 23312321027. The reversal of 23312321021 is 12012321332.

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 de Polignac number, because none of the positive numbers 2^k-23312321021 is a prime.

It is a super-2 number, since 2×23312321021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23312320984 and 23312321002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23312321027) 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, 1059650945 + ... + 1059650966.

It is an arithmetic number, because the mean of its divisors is an integer number (6357905736).

Almost surely, 2^23312321021 is an apocalyptic number.

It is an amenable number.

23312321021 is a deficient number, since it is larger than the sum of its proper divisors (2119301923).

23312321021 is a wasteful number, since it uses less digits than its factorization.

23312321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119301922.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 23312321021 its reverse (12012321332), we get a palindrome (35324642353).

The spelling of 23312321021 in words is "twenty-three billion, three hundred twelve million, three hundred twenty-one thousand, twenty-one".