331102220221 has 2 divisors, whose sum is σ = 331102220222. Its totient is φ = 331102220220.

The previous prime is 331102220209. The next prime is 331102220243. The reversal of 331102220221 is 122022201133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185598117721 + 145504102500 = 430811^2 + 381450^2 .

It is a cyclic number.

It is not a de Polignac number, because 331102220221 - 2¹³ = 331102212029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331102224221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165551110110 + 165551110111.

It is an arithmetic number, because the mean of its divisors is an integer number (165551110111).

Almost surely, 2^331102220221 is an apocalyptic number.

It is an amenable number.

331102220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

331102220221 is an equidigital number, since it uses as much as digits as its factorization.

331102220221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 331102220221 its reverse (122022201133), we get a palindrome (453124421354).

The spelling of 331102220221 in words is "three hundred thirty-one billion, one hundred two million, two hundred twenty thousand, two hundred twenty-one".