331121330221321 has 2 divisors, whose sum is σ = 331121330221322. Its totient is φ = 331121330221320.

The previous prime is 331121330221309. The next prime is 331121330221361. The reversal of 331121330221321 is 123122033121133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223212115881225 + 107909214340096 = 14940285^2 + 10387936^2 .

It is a cyclic number.

It is not a de Polignac number, because 331121330221321 - 2²⁷ = 331121196003593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 331121330221321.

It is not a weakly prime, because it can be changed into another prime (331121330221361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165560665110660 + 165560665110661.

It is an arithmetic number, because the mean of its divisors is an integer number (165560665110661).

Almost surely, 2^{331121330221321} is an apocalyptic number.

It is an amenable number.

331121330221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

331121330221321 is an equidigital number, since it uses as much as digits as its factorization.

331121330221321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 331121330221321 its reverse (123122033121133), we get a palindrome (454243363342454).

The spelling of 331121330221321 in words is "three hundred thirty-one trillion, one hundred twenty-one billion, three hundred thirty million, two hundred twenty-one thousand, three hundred twenty-one".