12321031 has 4 divisors (see below), whose sum is σ = 12856752. Its totient is φ = 11785312.

The previous prime is 12321017. The next prime is 12321041. The reversal of 12321031 is 13012321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12321031 - 2⁵ = 12320999 is a prime.

It is a super-2 number, since 2×12321031² = 303615609805922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321011) 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, 267826 + ... + 267871.

It is an arithmetic number, because the mean of its divisors is an integer number (3214188).

Almost surely, 2^12321031 is an apocalyptic number.

12321031 is a deficient number, since it is larger than the sum of its proper divisors (535721).

12321031 is an equidigital number, since it uses as much as digits as its factorization.

12321031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535720.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 12321031 is about 3510.1326185773. The cubic root of 12321031 is about 230.9665125148.

Adding to 12321031 its reverse (13012321), we get a palindrome (25333352).

The spelling of 12321031 in words is "twelve million, three hundred twenty-one thousand, thirty-one".