12102512409 has 12 divisors (see below), whose sum is σ = 18826130596. Its totient is φ = 7447699872.

The previous prime is 12102512407. The next prime is 12102512413. The reversal of 12102512409 is 90421520121.

12102512409 is a `hidden beast` number, since 1 + 2 + 1 + 0 + 251 + 2 + 409 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7297943184 + 4804569225 = 85428^2 + 69315^2 .

It is not a de Polignac number, because 12102512409 - 2¹ = 12102512407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12102512407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51720022 + ... + 51720255.

Almost surely, 2^12102512409 is an apocalyptic number.

It is an amenable number.

12102512409 is a deficient number, since it is larger than the sum of its proper divisors (6723618187).

12102512409 is a wasteful number, since it uses less digits than its factorization.

12102512409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103440296 (or 103440293 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 12102512409 in words is "twelve billion, one hundred two million, five hundred twelve thousand, four hundred nine".