321020320 has 24 divisors (see below), whose sum is σ = 758410884. Its totient is φ = 128408064.

The previous prime is 321020317. The next prime is 321020339. The reversal of 321020320 is 23020123.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 319551376 + 1468944 = 17876^2 + 1212^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 321020320.

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, 1003029 + ... + 1003348.

Almost surely, 2^321020320 is an apocalyptic number.

It is an amenable number.

321020320 is an abundant number, since it is smaller than the sum of its proper divisors (437390564).

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

321020320 is a wasteful number, since it uses less digits than its factorization.

321020320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006392 (or 2006384 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 321020320 is about 17917.0399340963. The cubic root of 321020320 is about 684.7165751650.

Adding to 321020320 its reverse (23020123), we get a palindrome (344040443).

The spelling of 321020320 in words is "three hundred twenty-one million, twenty thousand, three hundred twenty".