12310023021 has 4 divisors (see below), whose sum is σ = 16413364032. Its totient is φ = 8206682012.

The previous prime is 12310023013. The next prime is 12310023023. The reversal of 12310023021 is 12032001321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12032001321 = 3 ⋅4010667107.

It is a cyclic number.

It is not a de Polignac number, because 12310023021 - 2³ = 12310023013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12310023023) 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, 2051670501 + ... + 2051670506.

It is an arithmetic number, because the mean of its divisors is an integer number (4103341008).

Almost surely, 2^12310023021 is an apocalyptic number.

It is an amenable number.

12310023021 is a deficient number, since it is larger than the sum of its proper divisors (4103341011).

12310023021 is an equidigital number, since it uses as much as digits as its factorization.

12310023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103341010.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 12310023021 its reverse (12032001321), we get a palindrome (24342024342).

The spelling of 12310023021 in words is "twelve billion, three hundred ten million, twenty-three thousand, twenty-one".