12331321 has 4 divisors (see below), whose sum is σ = 12385872. Its totient is φ = 12276772.

The previous prime is 12331309. The next prime is 12331337. The reversal of 12331321 is 12313321.

12331321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12313321 = 17 ⋅724313.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12331321 is a prime.

It is a super-2 number, since 2×12331321² = 304122955210082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12331295 and 12331304.

It is not an unprimeable number, because it can be changed into a prime (12331301) 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, 26935 + ... + 27388.

It is an arithmetic number, because the mean of its divisors is an integer number (3096468).

Almost surely, 2^12331321 is an apocalyptic number.

It is an amenable number.

12331321 is a deficient number, since it is larger than the sum of its proper divisors (54551).

12331321 is an equidigital number, since it uses as much as digits as its factorization.

12331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54550.

The product of its digits is 108, while the sum is 16.

The square root of 12331321 is about 3511.5980692556. The cubic root of 12331321 is about 231.0307924195.

Adding to 12331321 its reverse (12313321), we get a palindrome (24644642).

The spelling of 12331321 in words is "twelve million, three hundred thirty-one thousand, three hundred twenty-one".