331121212222721 has 2 divisors, whose sum is σ = 331121212222722. Its totient is φ = 331121212222720.

The previous prime is 331121212222711. The next prime is 331121212222739. The reversal of 331121212222721 is 127222212121133.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306187528186225 + 24933684036496 = 17498215^2 + 4993364^2 .

It is a cyclic number.

It is not a de Polignac number, because 331121212222721 - 2³⁴ = 331104032353537 is a prime.

It is not a weakly prime, because it can be changed into another prime (331121212222711) 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, 165560606111360 + 165560606111361.

It is an arithmetic number, because the mean of its divisors is an integer number (165560606111361).

Almost surely, 2^{331121212222721} is an apocalyptic number.

It is an amenable number.

331121212222721 is a deficient number, since it is larger than the sum of its proper divisors (1).

331121212222721 is an equidigital number, since it uses as much as digits as its factorization.

331121212222721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

Adding to 331121212222721 its reverse (127222212121133), we get a palindrome (458343424343854).

The spelling of 331121212222721 in words is "three hundred thirty-one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, seven hundred twenty-one".