331321211321 has 4 divisors (see below), whose sum is σ = 340275838692. Its totient is φ = 322366583952.

The previous prime is 331321211317. The next prime is 331321211381. The reversal of 331321211321 is 123112123133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123112123133 = 43 ⋅2863072631.

It can be written as a sum of positive squares in 2 ways, for example, as 173525566096 + 157795645225 = 416564^2 + 397235^2 .

It is a cyclic number.

It is not a de Polignac number, because 331321211321 - 2² = 331321211317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (331321211381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4477313630 + ... + 4477313703.

It is an arithmetic number, because the mean of its divisors is an integer number (85068959673).

Almost surely, 2^331321211321 is an apocalyptic number.

It is an amenable number.

331321211321 is a deficient number, since it is larger than the sum of its proper divisors (8954627371).

331321211321 is an equidigital number, since it uses as much as digits as its factorization.

331321211321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8954627370.

The product of its digits is 648, while the sum is 23.

Adding to 331321211321 its reverse (123112123133), we get a palindrome (454433334454).

The spelling of 331321211321 in words is "three hundred thirty-one billion, three hundred twenty-one million, two hundred eleven thousand, three hundred twenty-one".