128861821083 has 4 divisors (see below), whose sum is σ = 171815761448. Its totient is φ = 85907880720.

The previous prime is 128861821061. The next prime is 128861821111. The reversal of 128861821083 is 380128168821.

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

It is not a de Polignac number, because 128861821083 - 2⁵ = 128861821051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128861821183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21476970178 + ... + 21476970183.

It is an arithmetic number, because the mean of its divisors is an integer number (42953940362).

Almost surely, 2^128861821083 is an apocalyptic number.

128861821083 is a deficient number, since it is larger than the sum of its proper divisors (42953940365).

128861821083 is an equidigital number, since it uses as much as digits as its factorization.

128861821083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42953940364.

The product of its (nonzero) digits is 294912, while the sum is 48.

The spelling of 128861821083 in words is "one hundred twenty-eight billion, eight hundred sixty-one million, eight hundred twenty-one thousand, eighty-three".