21468278688 has 96 divisors (see below), whose sum is σ = 58476116160. Its totient is φ = 6888161280.

The previous prime is 21468278687. The next prime is 21468278731. The reversal of 21468278688 is 88687286412.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (21468278687) 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 15 ways as a sum of consecutive naturals, for example, 909856 + ... + 933152.

It is an arithmetic number, because the mean of its divisors is an integer number (609126210).

Almost surely, 2^21468278688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21468278688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29238058080).

21468278688 is an abundant number, since it is smaller than the sum of its proper divisors (37007837472).

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

21468278688 is a wasteful number, since it uses less digits than its factorization.

21468278688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23670 (or 23662 counting only the distinct ones).

The product of its digits is 16515072, while the sum is 60.

The spelling of 21468278688 in words is "twenty-one billion, four hundred sixty-eight million, two hundred seventy-eight thousand, six hundred eighty-eight".