321304432220 has 48 divisors (see below), whose sum is σ = 698691117600. Its totient is φ = 123968221440.

The previous prime is 321304432217. The next prime is 321304432259. The reversal of 321304432220 is 22234403123.

It is a self number, because there is not a number n which added to its sum of digits gives 321304432220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320891 + ... + 863469.

It is an arithmetic number, because the mean of its divisors is an integer number (14556064950).

Almost surely, 2^321304432220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321304432220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349345558800).

321304432220 is an abundant number, since it is smaller than the sum of its proper divisors (377386685380).

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

321304432220 is a wasteful number, since it uses less digits than its factorization.

321304432220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543638 (or 543636 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 321304432220 its reverse (22234403123), we get a palindrome (343538835343).

The spelling of 321304432220 in words is "three hundred twenty-one billion, three hundred four million, four hundred thirty-two thousand, two hundred twenty".