331321231120421 has 2 divisors, whose sum is σ = 331321231120422. Its totient is φ = 331321231120420.

The previous prime is 331321231120351. The next prime is 331321231120427. The reversal of 331321231120421 is 124021132123133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 303066839704225 + 28254391416196 = 17408815^2 + 5315486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331321231120421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331321231120427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165660615560210 + 165660615560211.

It is an arithmetic number, because the mean of its divisors is an integer number (165660615560211).

Almost surely, 2^{331321231120421} is an apocalyptic number.

It is an amenable number.

331321231120421 is a deficient number, since it is larger than the sum of its proper divisors (1).

331321231120421 is an equidigital number, since it uses as much as digits as its factorization.

331321231120421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 331321231120421 its reverse (124021132123133), we get a palindrome (455342363243554).

The spelling of 331321231120421 in words is "three hundred thirty-one trillion, three hundred twenty-one billion, two hundred thirty-one million, one hundred twenty thousand, four hundred twenty-one".