12865321 has 4 divisors (see below), whose sum is σ = 14703232. Its totient is φ = 11027412.

The previous prime is 12865319. The next prime is 12865331. The reversal of 12865321 is 12356821.

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: 12356821 = 19 ⋅650359.

It is a cyclic number.

It is not a de Polignac number, because 12865321 - 2¹ = 12865319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12865321.

It is not an unprimeable number, because it can be changed into a prime (12865331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918945 + ... + 918958.

It is an arithmetic number, because the mean of its divisors is an integer number (3675808).

Almost surely, 2^12865321 is an apocalyptic number.

It is an amenable number.

12865321 is a deficient number, since it is larger than the sum of its proper divisors (1837911).

12865321 is an equidigital number, since it uses as much as digits as its factorization.

12865321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837910.

The product of its digits is 2880, while the sum is 28.

The square root of 12865321 is about 3586.8260342537. The cubic root of 12865321 is about 234.3186602595.

The spelling of 12865321 in words is "twelve million, eight hundred sixty-five thousand, three hundred twenty-one".