128236221129 has 8 divisors (see below), whose sum is σ = 172030595872. Its totient is φ = 84966330240.

The previous prime is 128236221119. The next prime is 128236221163. The reversal of 128236221129 is 921122632821.

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

It is not a de Polignac number, because 128236221129 - 2²⁰ = 128235172553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128236221119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131120392 + ... + 131121369.

It is an arithmetic number, because the mean of its divisors is an integer number (21503824484).

Almost surely, 2^128236221129 is an apocalyptic number.

It is an amenable number.

128236221129 is a deficient number, since it is larger than the sum of its proper divisors (43794374743).

128236221129 is a wasteful number, since it uses less digits than its factorization.

128236221129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262241927.

The product of its digits is 41472, while the sum is 39.

The spelling of 128236221129 in words is "one hundred twenty-eight billion, two hundred thirty-six million, two hundred twenty-one thousand, one hundred twenty-nine".