128092222721 has 4 divisors (see below), whose sum is σ = 128093550000. Its totient is φ = 128090895444.

The previous prime is 128092222663. The next prime is 128092222747. The reversal of 128092222721 is 127222290821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127222290821 = 71 ⋅1791863251.

It is a cyclic number.

It is not a de Polignac number, because 128092222721 - 2²² = 128088028417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128092221721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506471 + ... + 716028.

It is an arithmetic number, because the mean of its divisors is an integer number (32023387500).

Almost surely, 2^128092222721 is an apocalyptic number.

It is an amenable number.

128092222721 is a deficient number, since it is larger than the sum of its proper divisors (1327279).

128092222721 is a wasteful number, since it uses less digits than its factorization.

128092222721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327278.

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 128092222721 in words is "one hundred twenty-eight billion, ninety-two million, two hundred twenty-two thousand, seven hundred twenty-one".