13312321 has 4 divisors (see below), whose sum is σ = 14522544. Its totient is φ = 12102100.

The previous prime is 13312319. The next prime is 13312349. The reversal of 13312321 is 12321331.

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: 12321331 = 11 ⋅1120121.

It is a cyclic number.

It is not a de Polignac number, because 13312321 - 2¹ = 13312319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13312295 and 13312304.

It is not an unprimeable number, because it can be changed into a prime (13312391) 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, 605095 + ... + 605116.

It is an arithmetic number, because the mean of its divisors is an integer number (3630636).

Almost surely, 2^13312321 is an apocalyptic number.

13312321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13312321 is a deficient number, since it is larger than the sum of its proper divisors (1210223).

13312321 is a wasteful number, since it uses less digits than its factorization.

13312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210222.

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

The square root of 13312321 is about 3648.6053499933. The cubic root of 13312321 is about 237.0015904277.

Adding to 13312321 its reverse (12321331), we get a palindrome (25633652).

The spelling of 13312321 in words is "thirteen million, three hundred twelve thousand, three hundred twenty-one".