12312021021 has 16 divisors (see below), whose sum is σ = 17037451200. Its totient is φ = 7899147648.

The previous prime is 12312021017. The next prime is 12312021023. The reversal of 12312021021 is 12012021321.

It is not a de Polignac number, because 12312021021 - 2² = 12312021017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312021023) 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, 203776 + ... + 257193.

It is an arithmetic number, because the mean of its divisors is an integer number (1064840700).

Almost surely, 2^12312021021 is an apocalyptic number.

It is an amenable number.

12312021021 is a deficient number, since it is larger than the sum of its proper divisors (4725430179).

12312021021 is a wasteful number, since it uses less digits than its factorization.

12312021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461308.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12312021021 its reverse (12012021321), we get a palindrome (24324042342).

The spelling of 12312021021 in words is "twelve billion, three hundred twelve million, twenty-one thousand, twenty-one".