128033218121 has 2 divisors, whose sum is σ = 128033218122. Its totient is φ = 128033218120.

The previous prime is 128033218063. The next prime is 128033218127. The reversal of 128033218121 is 121812330821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96838593721 + 31194624400 = 311189^2 + 176620^2 .

It is a cyclic number.

It is not a de Polignac number, because 128033218121 - 2¹⁸ = 128032955977 is a prime.

It is not a weakly prime, because it can be changed into another prime (128033218127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64016609060 + 64016609061.

It is an arithmetic number, because the mean of its divisors is an integer number (64016609061).

Almost surely, 2^128033218121 is an apocalyptic number.

It is an amenable number.

128033218121 is a deficient number, since it is larger than the sum of its proper divisors (1).

128033218121 is an equidigital number, since it uses as much as digits as its factorization.

128033218121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

Adding to 128033218121 its reverse (121812330821), we get a palindrome (249845548942).

The spelling of 128033218121 in words is "one hundred twenty-eight billion, thirty-three million, two hundred eighteen thousand, one hundred twenty-one".