331122011221 has 2 divisors, whose sum is σ = 331122011222. Its totient is φ = 331122011220.

The previous prime is 331122011203. The next prime is 331122011251. The reversal of 331122011221 is 122110221133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 322125488721 + 8996522500 = 567561^2 + 94850^2 .

It is an emirp because it is prime and its reverse (122110221133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331122011221 - 2¹⁷ = 331121880149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331122011251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165561005610 + 165561005611.

It is an arithmetic number, because the mean of its divisors is an integer number (165561005611).

Almost surely, 2^331122011221 is an apocalyptic number.

It is an amenable number.

331122011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

331122011221 is an equidigital number, since it uses as much as digits as its factorization.

331122011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 331122011221 its reverse (122110221133), we get a palindrome (453232232354).

The spelling of 331122011221 in words is "three hundred thirty-one billion, one hundred twenty-two million, eleven thousand, two hundred twenty-one".