12312122021 has 16 divisors (see below), whose sum is σ = 12760747776. Its totient is φ = 11872398336.

The previous prime is 12312121993. The next prime is 12312122051. The reversal of 12312122021 is 12022121321.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12312122021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312122051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1028945 + ... + 1040841.

It is an arithmetic number, because the mean of its divisors is an integer number (797546736).

Almost surely, 2^12312122021 is an apocalyptic number.

It is an amenable number.

12312122021 is a deficient number, since it is larger than the sum of its proper divisors (448625755).

12312122021 is a wasteful number, since it uses less digits than its factorization.

12312122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12268.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12312122021 its reverse (12022121321), we get a palindrome (24334243342).

The spelling of 12312122021 in words is "twelve billion, three hundred twelve million, one hundred twenty-two thousand, twenty-one".