12312121023 has 12 divisors (see below), whose sum is σ = 17788486768. Its totient is φ = 8206090560.

The previous prime is 12312121001. The next prime is 12312121027. The reversal of 12312121023 is 32012121321.

It is not a de Polignac number, because 12312121023 - 2¹⁰ = 12312119999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12312120987 and 12312121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312121027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126163 + ... + 201348.

Almost surely, 2^12312121023 is an apocalyptic number.

12312121023 is a deficient number, since it is larger than the sum of its proper divisors (5476365745).

12312121023 is a wasteful number, since it uses less digits than its factorization.

12312121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331694 (or 331691 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12312121023 its reverse (32012121321), we get a palindrome (44324242344).

The spelling of 12312121023 in words is "twelve billion, three hundred twelve million, one hundred twenty-one thousand, twenty-three".