12387288921 has 32 divisors (see below), whose sum is σ = 18971117568. Its totient is φ = 7042823040.

The previous prime is 12387288913. The next prime is 12387288967. The reversal of 12387288921 is 12988278321.

12387288921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12387288921 - 2³ = 12387288913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12387286921) 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 31 ways as a sum of consecutive naturals, for example, 4459285 + ... + 4462061.

It is an arithmetic number, because the mean of its divisors is an integer number (592847424).

Almost surely, 2^12387288921 is an apocalyptic number.

It is an amenable number.

12387288921 is a deficient number, since it is larger than the sum of its proper divisors (6583828647).

12387288921 is a wasteful number, since it uses less digits than its factorization.

12387288921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3781.

The product of its digits is 774144, while the sum is 51.

The spelling of 12387288921 in words is "twelve billion, three hundred eighty-seven million, two hundred eighty-eight thousand, nine hundred twenty-one".