128756330411321 has 2 divisors, whose sum is σ = 128756330411322. Its totient is φ = 128756330411320.

The previous prime is 128756330411281. The next prime is 128756330411327. The reversal of 128756330411321 is 123114033657821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127479003235600 + 1277327175721 = 11290660^2 + 1130189^2 .

It is a cyclic number.

It is not a de Polignac number, because 128756330411321 - 2³⁰ = 128755256669497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (128756330411327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64378165205660 + 64378165205661.

It is an arithmetic number, because the mean of its divisors is an integer number (64378165205661).

Almost surely, 2^{128756330411321} is an apocalyptic number.

It is an amenable number.

128756330411321 is a deficient number, since it is larger than the sum of its proper divisors (1).

128756330411321 is an equidigital number, since it uses as much as digits as its factorization.

128756330411321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 128756330411321 in words is "one hundred twenty-eight trillion, seven hundred fifty-six billion, three hundred thirty million, four hundred eleven thousand, three hundred twenty-one".