321320002120 has 32 divisors (see below), whose sum is σ = 778583083320. Its totient is φ = 118641231360.

The previous prime is 321320002063. The next prime is 321320002151. The reversal of 321320002120 is 21200023123.

It can be written as a sum of positive squares in 4 ways, for example, as 242968154724 + 78351847396 = 492918^2 + 279914^2 .

It is a junction number, because it is equal to n+sod(n) for n = 321320002094 and 321320002103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308961021 + ... + 308962060.

Almost surely, 2^321320002120 is an apocalyptic number.

It is an amenable number.

321320002120 is an abundant number, since it is smaller than the sum of its proper divisors (457263081200).

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

321320002120 is a wasteful number, since it uses less digits than its factorization.

321320002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617923105 (or 617923101 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 321320002120 its reverse (21200023123), we get a palindrome (342520025243).

The spelling of 321320002120 in words is "three hundred twenty-one billion, three hundred twenty million, two thousand, one hundred twenty".