328239431221 has 4 divisors (see below), whose sum is σ = 353488618252. Its totient is φ = 302990244192.

The previous prime is 328239431213. The next prime is 328239431227. The reversal of 328239431221 is 122134932823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122134932823 = 8933 ⋅13672331.

It can be written as a sum of positive squares in 2 ways, for example, as 61596290596 + 266643140625 = 248186^2 + 516375^2 .

It is a cyclic number.

It is not a de Polignac number, because 328239431221 - 2³ = 328239431213 is a prime.

It is a super-2 number, since 2×328239431221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328239431227) 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, 12624593496 + ... + 12624593521.

It is an arithmetic number, because the mean of its divisors is an integer number (88372154563).

Almost surely, 2^328239431221 is an apocalyptic number.

It is an amenable number.

328239431221 is a deficient number, since it is larger than the sum of its proper divisors (25249187031).

328239431221 is a wasteful number, since it uses less digits than its factorization.

328239431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25249187030.

The product of its digits is 124416, while the sum is 40.

The spelling of 328239431221 in words is "three hundred twenty-eight billion, two hundred thirty-nine million, four hundred thirty-one thousand, two hundred twenty-one".