128921067105 has 32 divisors (see below), whose sum is σ = 212338326144. Its totient is φ = 66744953856.

The previous prime is 128921067083. The next prime is 128921067157. The reversal of 128921067105 is 501760129821.

It is not a de Polignac number, because 128921067105 - 2²⁶ = 128853958241 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 27919 + ... + 508548.

It is an arithmetic number, because the mean of its divisors is an integer number (6635572692).

Almost surely, 2^128921067105 is an apocalyptic number.

128921067105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128921067105 is a deficient number, since it is larger than the sum of its proper divisors (83417259039).

128921067105 is a wasteful number, since it uses less digits than its factorization.

128921067105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536945.

The product of its (nonzero) digits is 60480, while the sum is 42.

The spelling of 128921067105 in words is "one hundred twenty-eight billion, nine hundred twenty-one million, sixty-seven thousand, one hundred five".