12615321 has 16 divisors (see below), whose sum is σ = 17233920. Its totient is φ = 8205840.

The previous prime is 12615313. The next prime is 12615329. The reversal of 12615321 is 12351621.

12615321 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12615313) and next prime (12615329).

It is not a de Polignac number, because 12615321 - 2³ = 12615313 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12615329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46416 + ... + 46686.

It is an arithmetic number, because the mean of its divisors is an integer number (1077120).

Almost surely, 2^12615321 is an apocalyptic number.

It is an amenable number.

12615321 is a deficient number, since it is larger than the sum of its proper divisors (4618599).

12615321 is a wasteful number, since it uses less digits than its factorization.

12615321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596.

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

The square root of 12615321 is about 3551.8053156106. The cubic root of 12615321 is about 232.7909549691.

Adding to 12615321 its reverse (12351621), we get a palindrome (24966942).

The spelling of 12615321 in words is "twelve million, six hundred fifteen thousand, three hundred twenty-one".