331220211221221 has 16 divisors (see below), whose sum is σ = 378732688588800. Its totient is φ = 283756597504128.

The previous prime is 331220211221177. The next prime is 331220211221239. The reversal of 331220211221221 is 122122112022133.

It is not a de Polignac number, because 331220211221221 - 2¹⁷ = 331220211090149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331220211221261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104506185 + ... + 107628913.

It is an arithmetic number, because the mean of its divisors is an integer number (23670793036800).

Almost surely, 2^{331220211221221} is an apocalyptic number.

It is an amenable number.

331220211221221 is a deficient number, since it is larger than the sum of its proper divisors (47512477367579).

331220211221221 is a wasteful number, since it uses less digits than its factorization.

331220211221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3130548.

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

Adding to 331220211221221 its reverse (122122112022133), we get a palindrome (453342323243354).

The spelling of 331220211221221 in words is "three hundred thirty-one trillion, two hundred twenty billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".