321131320 has 32 divisors (see below), whose sum is σ = 723225600. Its totient is φ = 128331648.

The previous prime is 321131299. The next prime is 321131339. The reversal of 321131320 is 23131123.

It is a junction number, because it is equal to n+sod(n) for n = 321131294 and 321131303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48022 + ... + 54298.

It is an arithmetic number, because the mean of its divisors is an integer number (22600800).

Almost surely, 2^321131320 is an apocalyptic number.

It is an amenable number.

321131320 is an abundant number, since it is smaller than the sum of its proper divisors (402094280).

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

321131320 is a wasteful number, since it uses less digits than its factorization.

321131320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7567 (or 7563 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 321131320 is about 17920.1372762599. The cubic root of 321131320 is about 684.7954847924.

Adding to 321131320 its reverse (23131123), we get a palindrome (344262443).

It can be divided in two parts, 32113 and 1320, that added together give a palindrome (33433).

The spelling of 321131320 in words is "three hundred twenty-one million, one hundred thirty-one thousand, three hundred twenty".