128426828376121 has 8 divisors (see below), whose sum is σ = 140165075210688. Its totient is φ = 116699094978000.

The previous prime is 128426828376107. The next prime is 128426828376139. The reversal of 128426828376121 is 121673828624821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128426828376121 - 2³⁹ = 127877072562233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128426828376121.

It is not an unprimeable number, because it can be changed into a prime (128426828376421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2628333565 + ... + 2628382426.

It is an arithmetic number, because the mean of its divisors is an integer number (17520634401336).

Almost surely, 2^{128426828376121} is an apocalyptic number.

128426828376121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128426828376121 is a deficient number, since it is larger than the sum of its proper divisors (11738246834567).

128426828376121 is a wasteful number, since it uses less digits than its factorization.

128426828376121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5256718223.

The product of its digits is 24772608, while the sum is 61.

The spelling of 128426828376121 in words is "one hundred twenty-eight trillion, four hundred twenty-six billion, eight hundred twenty-eight million, three hundred seventy-six thousand, one hundred twenty-one".