12312323021 has 8 divisors (see below), whose sum is σ = 12527033784. Its totient is φ = 12098027520.

The previous prime is 12312322963. The next prime is 12312323033. The reversal of 12312323021 is 12032321321.

It can be written as a sum of positive squares in 4 ways, for example, as 1906282921 + 10406040100 = 43661^2 + 102010^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12312323021 - 2²² = 12308128717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12312322984 and 12312323002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312323081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43700 + ... + 162893.

It is an arithmetic number, because the mean of its divisors is an integer number (1565879223).

Almost surely, 2^12312323021 is an apocalyptic number.

It is an amenable number.

12312323021 is a deficient number, since it is larger than the sum of its proper divisors (214710763).

12312323021 is an equidigital number, since it uses as much as digits as its factorization.

12312323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207631.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 12312323021 its reverse (12032321321), we get a palindrome (24344644342).

The spelling of 12312323021 in words is "twelve billion, three hundred twelve million, three hundred twenty-three thousand, twenty-one".