321789018128 has 20 divisors (see below), whose sum is σ = 656280234960. Its totient is φ = 152426376864.

The previous prime is 321789018113. The next prime is 321789018137. The reversal of 321789018128 is 821810987123.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529257950 + ... + 529258557.

It is an arithmetic number, because the mean of its divisors is an integer number (32814011748).

Almost surely, 2^321789018128 is an apocalyptic number.

321789018128 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

321789018128 is an abundant number, since it is smaller than the sum of its proper divisors (334491216832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321789018128 is a wasteful number, since it uses less digits than its factorization.

321789018128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058516534 (or 1058516528 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 50.

The spelling of 321789018128 in words is "three hundred twenty-one billion, seven hundred eighty-nine million, eighteen thousand, one hundred twenty-eight".