331212120212221 has 16 divisors (see below), whose sum is σ = 335853552902400. Its totient is φ = 326582061781248.

The previous prime is 331212120212189. The next prime is 331212120212251. The reversal of 331212120212221 is 122212021212133.

It is a cyclic number.

It is not a de Polignac number, because 331212120212221 - 2⁵ = 331212120212189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331212120212251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340556385 + ... + 341527561.

It is an arithmetic number, because the mean of its divisors is an integer number (20990847056400).

Almost surely, 2^{331212120212221} is an apocalyptic number.

It is an amenable number.

331212120212221 is a deficient number, since it is larger than the sum of its proper divisors (4641432690179).

331212120212221 is an equidigital number, since it uses as much as digits as its factorization.

331212120212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977028.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 331212120212221 its reverse (122212021212133), we get a palindrome (453424141424354).

The spelling of 331212120212221 in words is "three hundred thirty-one trillion, two hundred twelve billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".