321131002220 has 48 divisors (see below), whose sum is σ = 776259160320. Its totient is φ = 109309950144.

The previous prime is 321131002219. The next prime is 321131002253. The reversal of 321131002220 is 22200131123.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8231594 + ... + 8270513.

It is an arithmetic number, because the mean of its divisors is an integer number (16172065840).

Almost surely, 2^321131002220 is an apocalyptic number.

It is an amenable number.

321131002220 is an abundant number, since it is smaller than the sum of its proper divisors (455128158100).

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

321131002220 is a wasteful number, since it uses less digits than its factorization.

321131002220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16502262 (or 16502260 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 321131002220 its reverse (22200131123), we get a palindrome (343331133343).

The spelling of 321131002220 in words is "three hundred twenty-one billion, one hundred thirty-one million, two thousand, two hundred twenty".