331221032000021 has 2 divisors, whose sum is σ = 331221032000022. Its totient is φ = 331221032000020.

The previous prime is 331221032000017. The next prime is 331221032000029. The reversal of 331221032000021 is 120000230122133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 299434991556100 + 31786040443921 = 17304190^2 + 5637911^2 .

It is a cyclic number.

It is not a de Polignac number, because 331221032000021 - 2² = 331221032000017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331221031999957 and 331221032000002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331221032000029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165610516000010 + 165610516000011.

It is an arithmetic number, because the mean of its divisors is an integer number (165610516000011).

Almost surely, 2^{331221032000021} is an apocalyptic number.

It is an amenable number.

331221032000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

331221032000021 is an equidigital number, since it uses as much as digits as its factorization.

331221032000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 331221032000021 its reverse (120000230122133), we get a palindrome (451221262122154).

The spelling of 331221032000021 in words is "three hundred thirty-one trillion, two hundred twenty-one billion, thirty-two million, twenty-one", and thus it is an aban number.