12121653636 has 36 divisors (see below), whose sum is σ = 31072414464. Its totient is φ = 3983641200.

The previous prime is 12121653629. The next prime is 12121653641. The reversal of 12121653636 is 63635612121.

12121653636 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 16 + 5 + 3 + 636 = 666.

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 a self number, because there is not a number n which added to its sum of digits gives 12121653636.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2368660 + ... + 2373771.

It is an arithmetic number, because the mean of its divisors is an integer number (863122624).

Almost surely, 2^12121653636 is an apocalyptic number.

It is an amenable number.

12121653636 is an abundant number, since it is smaller than the sum of its proper divisors (18950760828).

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

12121653636 is a wasteful number, since it uses less digits than its factorization.

12121653636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742512 (or 4742507 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The spelling of 12121653636 in words is "twelve billion, one hundred twenty-one million, six hundred fifty-three thousand, six hundred thirty-six".