921428971868159 has 4 divisors (see below), whose sum is σ = 921437705649216. Its totient is φ = 921420238087104.

The previous prime is 921428971868089. The next prime is 921428971868201. The reversal of 921428971868159 is 951868179824129.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 921428971868159 - 2²⁸ = 921428703432703 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 (921428971868059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4366732274 + ... + 4366943279.

It is an arithmetic number, because the mean of its divisors is an integer number (230359426412304).

Almost surely, 2^{921428971868159} is an apocalyptic number.

921428971868159 is a deficient number, since it is larger than the sum of its proper divisors (8733781057).

921428971868159 is a wasteful number, since it uses less digits than its factorization.

921428971868159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8733781056.

The product of its digits is 1254113280, while the sum is 80.

The spelling of 921428971868159 in words is "nine hundred twenty-one trillion, four hundred twenty-eight billion, nine hundred seventy-one million, eight hundred sixty-eight thousand, one hundred fifty-nine".