128218479121 has 2 divisors, whose sum is σ = 128218479122. Its totient is φ = 128218479120.

The previous prime is 128218479113. The next prime is 128218479131. The reversal of 128218479121 is 121974812821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112133898496 + 16084580625 = 334864^2 + 126825^2 .

It is a cyclic number.

It is not a de Polignac number, because 128218479121 - 2³ = 128218479113 is a prime.

It is not a weakly prime, because it can be changed into another prime (128218479131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64109239560 + 64109239561.

It is an arithmetic number, because the mean of its divisors is an integer number (64109239561).

Almost surely, 2^128218479121 is an apocalyptic number.

It is an amenable number.

128218479121 is a deficient number, since it is larger than the sum of its proper divisors (1).

128218479121 is an equidigital number, since it uses as much as digits as its factorization.

128218479121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 46.

The spelling of 128218479121 in words is "one hundred twenty-eight billion, two hundred eighteen million, four hundred seventy-nine thousand, one hundred twenty-one".