331221212 has 12 divisors (see below), whose sum is σ = 662442480. Its totient is φ = 141951936.

The previous prime is 331221203. The next prime is 331221239. The reversal of 331221212 is 212122133.

331221212 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5914637 + ... + 5914692.

It is an arithmetic number, because the mean of its divisors is an integer number (55203540).

Almost surely, 2^331221212 is an apocalyptic number.

It is an amenable number.

331221212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

331221212 is a wasteful number, since it uses less digits than its factorization.

331221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11829340 (or 11829338 counting only the distinct ones).

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

The square root of 331221212 is about 18199.4838388346. The cubic root of 331221212 is about 691.8937071529.

Adding to 331221212 its reverse (212122133), we get a palindrome (543343345).

The spelling of 331221212 in words is "three hundred thirty-one million, two hundred twenty-one thousand, two hundred twelve".