331033221221 has 2 divisors, whose sum is σ = 331033221222. Its totient is φ = 331033221220.

The previous prime is 331033221193. The next prime is 331033221241. The reversal of 331033221221 is 122122330133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 272887132996 + 58146088225 = 522386^2 + 241135^2 .

It is an emirp because it is prime and its reverse (122122330133) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331033221221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331033221241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165516610610 + 165516610611.

It is an arithmetic number, because the mean of its divisors is an integer number (165516610611).

Almost surely, 2^331033221221 is an apocalyptic number.

It is an amenable number.

331033221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

331033221221 is an equidigital number, since it uses as much as digits as its factorization.

331033221221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 331033221221 its reverse (122122330133), we get a palindrome (453155551354).

The spelling of 331033221221 in words is "three hundred thirty-one billion, thirty-three million, two hundred twenty-one thousand, two hundred twenty-one".