321320240 has 20 divisors (see below), whose sum is σ = 747069744. Its totient is φ = 128528064.

The previous prime is 321320221. The next prime is 321320269. The reversal of 321320240 is 42023123.

It is a tau number, because it is divible by the number of its divisors (20).

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, 2008172 + ... + 2008331.

Almost surely, 2^321320240 is an apocalyptic number.

It is an amenable number.

321320240 is an abundant number, since it is smaller than the sum of its proper divisors (425749504).

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

321320240 is a wasteful number, since it uses less digits than its factorization.

321320240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016516 (or 4016510 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 321320240 is about 17925.4076662150. The cubic root of 321320240 is about 684.9297457563.

Adding to 321320240 its reverse (42023123), we get a palindrome (363343363).

The spelling of 321320240 in words is "three hundred twenty-one million, three hundred twenty thousand, two hundred forty".