12565321 has 4 divisors (see below), whose sum is σ = 12574672. Its totient is φ = 12555972.

The previous prime is 12565307. The next prime is 12565339. The reversal of 12565321 is 12356521.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12356521 = 433 ⋅28537.

It is a cyclic number.

It is not a de Polignac number, because 12565321 - 2¹¹ = 12563273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12565361) 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, 2235 + ... + 5488.

It is an arithmetic number, because the mean of its divisors is an integer number (3143668).

Almost surely, 2^12565321 is an apocalyptic number.

It is an amenable number.

12565321 is a deficient number, since it is larger than the sum of its proper divisors (9351).

12565321 is an equidigital number, since it uses as much as digits as its factorization.

12565321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9350.

The product of its digits is 1800, while the sum is 25.

The square root of 12565321 is about 3544.7596533475. The cubic root of 12565321 is about 232.4829971765.

The spelling of 12565321 in words is "twelve million, five hundred sixty-five thousand, three hundred twenty-one".