128052821989 has 2 divisors, whose sum is σ = 128052821990. Its totient is φ = 128052821988.

The previous prime is 128052821951. The next prime is 128052822011. The reversal of 128052821989 is 989128250821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70313537889 + 57739284100 = 265167^2 + 240290^2 .

It is an emirp because it is prime and its reverse (989128250821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128052821989 is a prime.

It is a super-2 number, since 2×128052821989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128052821909) 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, 64026410994 + 64026410995.

It is an arithmetic number, because the mean of its divisors is an integer number (64026410995).

Almost surely, 2^128052821989 is an apocalyptic number.

It is an amenable number.

128052821989 is a deficient number, since it is larger than the sum of its proper divisors (1).

128052821989 is an equidigital number, since it uses as much as digits as its factorization.

128052821989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 55.

The spelling of 128052821989 in words is "one hundred twenty-eight billion, fifty-two million, eight hundred twenty-one thousand, nine hundred eighty-nine".