331221231 has 40 divisors (see below), whose sum is σ = 542513664. Its totient is φ = 199720080.

The previous prime is 331221203. The next prime is 331221239. The reversal of 331221231 is 132122133.

It is not a de Polignac number, because 331221231 - 2⁵ = 331221199 is a prime.

It is a super-2 number, since 2×331221231² = 219415007730310722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331221239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 197860 + ... + 199526.

Almost surely, 2^331221231 is an apocalyptic number.

331221231 is a deficient number, since it is larger than the sum of its proper divisors (211292433).

331221231 is a wasteful number, since it uses less digits than its factorization.

331221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913 (or 1904 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 331221231 is about 18199.4843608274. The cubic root of 331221231 is about 691.8937203827.

Adding to 331221231 its reverse (132122133), we get a palindrome (463343364).

The spelling of 331221231 in words is "three hundred thirty-one million, two hundred twenty-one thousand, two hundred thirty-one".