128253862281121 has 2 divisors, whose sum is σ = 128253862281122. Its totient is φ = 128253862281120.

The previous prime is 128253862281113. The next prime is 128253862281253. The reversal of 128253862281121 is 121182268352821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112850678534400 + 15403183746721 = 10623120^2 + 3924689^2 .

It is a cyclic number.

It is not a de Polignac number, because 128253862281121 - 2³ = 128253862281113 is a prime.

It is not a weakly prime, because it can be changed into another prime (128253862281421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64126931140560 + 64126931140561.

It is an arithmetic number, because the mean of its divisors is an integer number (64126931140561).

Almost surely, 2^{128253862281121} is an apocalyptic number.

It is an amenable number.

128253862281121 is a deficient number, since it is larger than the sum of its proper divisors (1).

128253862281121 is an equidigital number, since it uses as much as digits as its factorization.

128253862281121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1474560, while the sum is 52.

The spelling of 128253862281121 in words is "one hundred twenty-eight trillion, two hundred fifty-three billion, eight hundred sixty-two million, two hundred eighty-one thousand, one hundred twenty-one".