331221033321331 has 2 divisors, whose sum is σ = 331221033321332. Its totient is φ = 331221033321330.

The previous prime is 331221033321293. The next prime is 331221033321379. The reversal of 331221033321331 is 133123330122133.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 331221033321331 - 2¹¹ = 331221033319283 is a prime.

It is a super-2 number, since 2×331221033321331² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331221033321293 and 331221033321302.

It is not a weakly prime, because it can be changed into another prime (331221033321391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165610516660665 + 165610516660666.

It is an arithmetic number, because the mean of its divisors is an integer number (165610516660666).

Almost surely, 2^{331221033321331} is an apocalyptic number.

331221033321331 is a deficient number, since it is larger than the sum of its proper divisors (1).

331221033321331 is an equidigital number, since it uses as much as digits as its factorization.

331221033321331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 31.

Adding to 331221033321331 its reverse (133123330122133), we get a palindrome (464344363443464).

The spelling of 331221033321331 in words is "three hundred thirty-one trillion, two hundred twenty-one billion, thirty-three million, three hundred twenty-one thousand, three hundred thirty-one".