168068305021 has 4 divisors (see below), whose sum is σ = 170195752000. Its totient is φ = 165940858044.

The previous prime is 168068305003. The next prime is 168068305057. The reversal of 168068305021 is 120503860861.

168068305021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 168068305021 - 2³¹ = 165920821373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168068305081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063723371 + ... + 1063723528.

It is an arithmetic number, because the mean of its divisors is an integer number (42548938000).

Almost surely, 2^168068305021 is an apocalyptic number.

It is an amenable number.

168068305021 is a deficient number, since it is larger than the sum of its proper divisors (2127446979).

168068305021 is an equidigital number, since it uses as much as digits as its factorization.

168068305021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127446978.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 168068305021 in words is "one hundred sixty-eight billion, sixty-eight million, three hundred five thousand, twenty-one".