321013019988 has 18 divisors (see below), whose sum is σ = 811449578394. Its totient is φ = 107004339984.

The previous prime is 321013019927. The next prime is 321013019989. The reversal of 321013019988 is 889910310123.

321013019988 is a `hidden beast` number, since 321 + 0 + 130 + 199 + 8 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 278258360004 + 42754659984 = 527502^2 + 206772^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321013019989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4458514131 + ... + 4458514202.

It is an arithmetic number, because the mean of its divisors is an integer number (45080532133).

Almost surely, 2^321013019988 is an apocalyptic number.

It is an amenable number.

321013019988 is an abundant number, since it is smaller than the sum of its proper divisors (490436558406).

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

321013019988 is a wasteful number, since it uses less digits than its factorization.

321013019988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8917028343 (or 8917028338 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 321013019988 in words is "three hundred twenty-one billion, thirteen million, nineteen thousand, nine hundred eighty-eight".