128138213220 has 24 divisors (see below), whose sum is σ = 358786997184. Its totient is φ = 34170190176.

The previous prime is 128138213173. The next prime is 128138213297. The reversal of 128138213220 is 22312831821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1067818384 + ... + 1067818503.

It is an arithmetic number, because the mean of its divisors is an integer number (14949458216).

Almost surely, 2^128138213220 is an apocalyptic number.

128138213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128138213220 is an abundant number, since it is smaller than the sum of its proper divisors (230648783964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128138213220 is a wasteful number, since it uses less digits than its factorization.

128138213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135636899 (or 2135636897 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 128138213220 in words is "one hundred twenty-eight billion, one hundred thirty-eight million, two hundred thirteen thousand, two hundred twenty".