21328276689 has 6 divisors (see below), whose sum is σ = 30807510786. Its totient is φ = 14218851120.

The previous prime is 21328276681. The next prime is 21328276691. The reversal of 21328276689 is 98667282312.

21328276689 is a `hidden beast` number, since 213 + 282 + 76 + 6 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19027443600 + 2300833089 = 137940^2 + 47967^2 .

It is not a de Polignac number, because 21328276689 - 2³ = 21328276681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21328276681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1184904252 + ... + 1184904269.

It is an arithmetic number, because the mean of its divisors is an integer number (5134585131).

Almost surely, 2^21328276689 is an apocalyptic number.

It is an amenable number.

21328276689 is a deficient number, since it is larger than the sum of its proper divisors (9479234097).

21328276689 is a wasteful number, since it uses less digits than its factorization.

21328276689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369808527 (or 2369808524 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The spelling of 21328276689 in words is "twenty-one billion, three hundred twenty-eight million, two hundred seventy-six thousand, six hundred eighty-nine".