331221311212 has 12 divisors (see below), whose sum is σ = 632331594216. Its totient is φ = 150555141440.

The previous prime is 331221311189. The next prime is 331221311219. The reversal of 331221311212 is 212113122133.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (331221311219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3763878493 + ... + 3763878580.

It is an arithmetic number, because the mean of its divisors is an integer number (52694299518).

Almost surely, 2^331221311212 is an apocalyptic number.

It is an amenable number.

331221311212 is a deficient number, since it is larger than the sum of its proper divisors (301110283004).

331221311212 is a wasteful number, since it uses less digits than its factorization.

331221311212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7527757088 (or 7527757086 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

Adding to 331221311212 its reverse (212113122133), we get a palindrome (543334433345).

The spelling of 331221311212 in words is "three hundred thirty-one billion, two hundred twenty-one million, three hundred eleven thousand, two hundred twelve".