321315320 has 16 divisors (see below), whose sum is σ = 722959560. Its totient is φ = 128526112.

The previous prime is 321315311. The next prime is 321315349. The reversal of 321315320 is 23513123.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 321315292 and 321315301.

It is a congruent number.

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, 4016402 + ... + 4016481.

Almost surely, 2^321315320 is an apocalyptic number.

It is an amenable number.

321315320 is an abundant number, since it is smaller than the sum of its proper divisors (401644240).

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

321315320 is a wasteful number, since it uses less digits than its factorization.

321315320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8032894 (or 8032890 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 321315320 is about 17925.2704303171. The cubic root of 321315320 is about 684.9262498965.

Adding to 321315320 its reverse (23513123), we get a palindrome (344828443).

The spelling of 321315320 in words is "three hundred twenty-one million, three hundred fifteen thousand, three hundred twenty".