23011312021 has 4 divisors (see below), whose sum is σ = 24011803872. Its totient is φ = 22010820172.

The previous prime is 23011312007. The next prime is 23011312031. The reversal of 23011312021 is 12021311032.

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 23011312021 - 2¹⁵ = 23011279253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23011311986 and 23011312004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23011312031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500245891 + ... + 500245936.

It is an arithmetic number, because the mean of its divisors is an integer number (6002950968).

Almost surely, 2^23011312021 is an apocalyptic number.

It is an amenable number.

23011312021 is a deficient number, since it is larger than the sum of its proper divisors (1000491851).

23011312021 is a wasteful number, since it uses less digits than its factorization.

23011312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000491850.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 23011312021 its reverse (12021311032), we get a palindrome (35032623053).

The spelling of 23011312021 in words is "twenty-three billion, eleven million, three hundred twelve thousand, twenty-one".