12168680721 has 8 divisors (see below), whose sum is σ = 16296383904. Its totient is φ = 8076715680.

The previous prime is 12168680717. The next prime is 12168680737. The reversal of 12168680721 is 12708686121.

12168680721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12168680721 - 2² = 12168680717 is a prime.

It is a super-3 number, since 3×12168680721³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (12168680791) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8933740 + ... + 8935101.

It is an arithmetic number, because the mean of its divisors is an integer number (2037047988).

Almost surely, 2^12168680721 is an apocalyptic number.

It is an amenable number.

12168680721 is a deficient number, since it is larger than the sum of its proper divisors (4127703183).

12168680721 is a wasteful number, since it uses less digits than its factorization.

12168680721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17869071.

The product of its (nonzero) digits is 64512, while the sum is 42.

The spelling of 12168680721 in words is "twelve billion, one hundred sixty-eight million, six hundred eighty thousand, seven hundred twenty-one".