321345304520 has 32 divisors (see below), whose sum is σ = 725110617600. Its totient is φ = 128167689408.

The previous prime is 321345304499. The next prime is 321345304549. The reversal of 321345304520 is 25403543123.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11561960 + ... + 11589719.

It is an arithmetic number, because the mean of its divisors is an integer number (22659706800).

Almost surely, 2^321345304520 is an apocalyptic number.

It is an amenable number.

321345304520 is an abundant number, since it is smaller than the sum of its proper divisors (403765313080).

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

321345304520 is a wasteful number, since it uses less digits than its factorization.

321345304520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23152037 (or 23152033 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 321345304520 its reverse (25403543123), we get a palindrome (346748847643).

The spelling of 321345304520 in words is "three hundred twenty-one billion, three hundred forty-five million, three hundred four thousand, five hundred twenty".