12316521 has 8 divisors (see below), whose sum is σ = 18768064. Its totient is φ = 7038000.

The previous prime is 12316471. The next prime is 12316529. The reversal of 12316521 is 12561321.

12316521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12316521 - 2⁶ = 12316457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 586501 = 12316521 / (1 + 2 + 3 + 1 + 6 + 5 + 2 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12316529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293230 + ... + 293271.

It is an arithmetic number, because the mean of its divisors is an integer number (2346008).

Almost surely, 2^12316521 is an apocalyptic number.

It is an amenable number.

12316521 is a deficient number, since it is larger than the sum of its proper divisors (6451543).

12316521 is an equidigital number, since it uses as much as digits as its factorization.

12316521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586511.

The product of its digits is 360, while the sum is 21.

The square root of 12316521 is about 3509.4901339083. The cubic root of 12316521 is about 230.9383280202.

Adding to 12316521 its reverse (12561321), we get a palindrome (24877842).

The spelling of 12316521 in words is "twelve million, three hundred sixteen thousand, five hundred twenty-one".