128065321 has 2 divisors, whose sum is σ = 128065322. Its totient is φ = 128065320.

The previous prime is 128065303. The next prime is 128065349. The reversal of 128065321 is 123560821.

It is an a-pointer prime, because the next prime (128065349) can be obtained adding 128065321 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96255721 + 31809600 = 9811^2 + 5640^2 .

It is an emirp because it is prime and its reverse (123560821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128065321 - 2⁷ = 128065193 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128065321.

It is not a weakly prime, because it can be changed into another prime (128065361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64032660 + 64032661.

It is an arithmetic number, because the mean of its divisors is an integer number (64032661).

Almost surely, 2^128065321 is an apocalyptic number.

It is an amenable number.

128065321 is a deficient number, since it is larger than the sum of its proper divisors (1).

128065321 is an equidigital number, since it uses as much as digits as its factorization.

128065321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 128065321 is about 11316.5949384079. The cubic root of 128065321 is about 504.0541338196.

The spelling of 128065321 in words is "one hundred twenty-eight million, sixty-five thousand, three hundred twenty-one".