100128197227 has 4 divisors (see below), whose sum is σ = 100313277616. Its totient is φ = 99943116840.

The previous prime is 100128197219. The next prime is 100128197333. The reversal of 100128197227 is 722791821001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100128197227 - 2³ = 100128197219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100128197227.

It is not an unprimeable number, because it can be changed into a prime (100128197927) 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, 92539383 + ... + 92540464.

It is an arithmetic number, because the mean of its divisors is an integer number (25078319404).

Almost surely, 2^100128197227 is an apocalyptic number.

100128197227 is a deficient number, since it is larger than the sum of its proper divisors (185080389).

100128197227 is an equidigital number, since it uses as much as digits as its factorization.

100128197227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185080388.

The product of its (nonzero) digits is 28224, while the sum is 40.

The spelling of 100128197227 in words is "one hundred billion, one hundred twenty-eight million, one hundred ninety-seven thousand, two hundred twenty-seven".