12121635564 has 36 divisors (see below), whose sum is σ = 31468934224. Its totient is φ = 3931340832.

The previous prime is 12121635521. The next prime is 12121635577. The reversal of 12121635564 is 46553612121.

12121635564 is a `hidden beast` number, since 1 + 2 + 12 + 1 + 635 + 5 + 6 + 4 = 666.

12121635564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 4548832 + ... + 4551495.

Almost surely, 2^12121635564 is an apocalyptic number.

It is an amenable number.

12121635564 is an abundant number, since it is smaller than the sum of its proper divisors (19347298660).

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

12121635564 is a wasteful number, since it uses less digits than its factorization.

12121635564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9100374 (or 9100369 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 12121635564 in words is "twelve billion, one hundred twenty-one million, six hundred thirty-five thousand, five hundred sixty-four".