12321587 has 4 divisors (see below), whose sum is σ = 12347376. Its totient is φ = 12295800.

The previous prime is 12321577. The next prime is 12321593. The reversal of 12321587 is 78512321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78512321 = 1217 ⋅64513.

It is a cyclic number.

It is not a de Polignac number, because 12321587 - 2⁴ = 12321571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12321577) 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, 12164 + ... + 13137.

It is an arithmetic number, because the mean of its divisors is an integer number (3086844).

Almost surely, 2^12321587 is an apocalyptic number.

12321587 is a deficient number, since it is larger than the sum of its proper divisors (25789).

12321587 is an equidigital number, since it uses as much as digits as its factorization.

12321587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25788.

The product of its digits is 3360, while the sum is 29.

The square root of 12321587 is about 3510.2118169706. The cubic root of 12321587 is about 230.9699866680.

The spelling of 12321587 in words is "twelve million, three hundred twenty-one thousand, five hundred eighty-seven".