21207128096 has 48 divisors (see below), whose sum is σ = 52053865920. Its totient is φ = 8262516480.

The previous prime is 21207128071. The next prime is 21207128099. The reversal of 21207128096 is 69082170212.

It is not an unprimeable number, because it can be changed into a prime (21207128099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4300931 + ... + 4305858.

It is an arithmetic number, because the mean of its divisors is an integer number (1084455540).

Almost surely, 2^21207128096 is an apocalyptic number.

It is an amenable number.

21207128096 is an abundant number, since it is smaller than the sum of its proper divisors (30846737824).

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

21207128096 is a wasteful number, since it uses less digits than its factorization.

21207128096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8606817 (or 8606809 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 21207128096 in words is "twenty-one billion, two hundred seven million, one hundred twenty-eight thousand, ninety-six".