12123515412 has 36 divisors (see below), whose sum is σ = 30799568800. Its totient is φ = 4020862032.

The previous prime is 12123515401. The next prime is 12123515419. The reversal of 12123515412 is 21451532121.

It is a happy number.

12123515412 is a `hidden beast` number, since 1 + 2 + 1 + 235 + 15 + 412 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×12123515412³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123515419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 838978 + ... + 853305.

Almost surely, 2^12123515412 is an apocalyptic number.

12123515412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12123515412 is an abundant number, since it is smaller than the sum of its proper divisors (18676053388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12123515412 is a wasteful number, since it uses less digits than its factorization.

12123515412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692492 (or 1692487 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The spelling of 12123515412 in words is "twelve billion, one hundred twenty-three million, five hundred fifteen thousand, four hundred twelve".