189364310821 has 4 divisors (see below), whose sum is σ = 216416355232. Its totient is φ = 162312266412.

The previous prime is 189364310803. The next prime is 189364310831. The reversal of 189364310821 is 128013463981.

189364310821 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 189364310821 - 2²³ = 189355922213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189364310831) 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, 13526022195 + ... + 13526022208.

It is an arithmetic number, because the mean of its divisors is an integer number (54104088808).

Almost surely, 2^189364310821 is an apocalyptic number.

It is an amenable number.

189364310821 is a deficient number, since it is larger than the sum of its proper divisors (27052044411).

189364310821 is an equidigital number, since it uses as much as digits as its factorization.

189364310821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27052044410.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 189364310821 in words is "one hundred eighty-nine billion, three hundred sixty-four million, three hundred ten thousand, eight hundred twenty-one".