12505321 has 4 divisors (see below), whose sum is σ = 12527572. Its totient is φ = 12483072.

The previous prime is 12505313. The next prime is 12505327. The reversal of 12505321 is 12350521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12390400 + 114921 = 3520^2 + 339^2 .

It is a cyclic number.

It is not a de Polignac number, because 12505321 - 2³ = 12505313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12505327) 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, 10260 + ... + 11413.

It is an arithmetic number, because the mean of its divisors is an integer number (3131893).

Almost surely, 2^12505321 is an apocalyptic number.

It is an amenable number.

12505321 is a deficient number, since it is larger than the sum of its proper divisors (22251).

12505321 is an equidigital number, since it uses as much as digits as its factorization.

12505321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22250.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 12505321 is about 3536.2863289049. The cubic root of 12505321 is about 232.1123675347.

Adding to 12505321 its reverse (12350521), we get a palindrome (24855842).

The spelling of 12505321 in words is "twelve million, five hundred five thousand, three hundred twenty-one".