331221320 has 32 divisors (see below), whose sum is σ = 745814520. Its totient is φ = 132387840.

The previous prime is 331221307. The next prime is 331221337. The reversal of 331221320 is 23122133.

It can be written as a sum of positive squares in 4 ways, for example, as 227466724 + 103754596 = 15082^2 + 10186^2 .

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, 72710 + ... + 77130.

Almost surely, 2^331221320 is an apocalyptic number.

It is an amenable number.

331221320 is an abundant number, since it is smaller than the sum of its proper divisors (414593200).

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

331221320 is a wasteful number, since it uses less digits than its factorization.

331221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6305 (or 6301 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 331221320 is about 18199.4868059514. The cubic root of 331221320 is about 691.8937823539.

Adding to 331221320 its reverse (23122133), we get a palindrome (354343453).

The spelling of 331221320 in words is "three hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty".