12171321013356 has 72 divisors (see below), whose sum is σ = 30848084103200. Its totient is φ = 4046338955520.

The previous prime is 12171321013331. The next prime is 12171321013433. The reversal of 12171321013356 is 65331012317121.

12171321013356 is a `hidden beast` number, since 1 + 2 + 171 + 32 + 101 + 3 + 356 = 666.

It is a super-2 number, since 2×12171321013356² (a number of 27 digits) contains 22 as substring.

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 12171321013356.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72195921 + ... + 72364311.

Almost surely, 2^{12171321013356} is an apocalyptic number.

It is an amenable number.

12171321013356 is an abundant number, since it is smaller than the sum of its proper divisors (18676763089844).

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

12171321013356 is a wasteful number, since it uses less digits than its factorization.

12171321013356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173719 (or 173714 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The spelling of 12171321013356 in words is "twelve trillion, one hundred seventy-one billion, three hundred twenty-one million, thirteen thousand, three hundred fifty-six".