168221414721 has 32 divisors (see below), whose sum is σ = 232745840640. Its totient is φ = 108005976000.

The previous prime is 168221414717. The next prime is 168221414743. The reversal of 168221414721 is 127414122861.

It is not a de Polignac number, because 168221414721 - 2² = 168221414717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168221414721.

It is not an unprimeable number, because it can be changed into a prime (168221484721) 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 31 ways as a sum of consecutive naturals, for example, 6469296 + ... + 6495246.

It is an arithmetic number, because the mean of its divisors is an integer number (7273307520).

Almost surely, 2^168221414721 is an apocalyptic number.

It is an amenable number.

168221414721 is a deficient number, since it is larger than the sum of its proper divisors (64524425919).

168221414721 is a wasteful number, since it uses less digits than its factorization.

168221414721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26757.

The product of its digits is 43008, while the sum is 39.

The spelling of 168221414721 in words is "one hundred sixty-eight billion, two hundred twenty-one million, four hundred fourteen thousand, seven hundred twenty-one".