21698275264 has 56 divisors (see below), whose sum is σ = 44486840160. Its totient is φ = 10492517376.

The previous prime is 21698275229. The next prime is 21698275273. The reversal of 21698275264 is 46257289612.

It is a happy number.

It is a congruent number.

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, 368022 + ... + 422890.

It is an arithmetic number, because the mean of its divisors is an integer number (794407860).

Almost surely, 2^21698275264 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 21698275264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22243420080).

21698275264 is an abundant number, since it is smaller than the sum of its proper divisors (22788564896).

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

21698275264 is a wasteful number, since it uses less digits than its factorization.

21698275264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55085 (or 55075 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 52.

The spelling of 21698275264 in words is "twenty-one billion, six hundred ninety-eight million, two hundred seventy-five thousand, two hundred sixty-four".