21717418404 has 96 divisors (see below), whose sum is σ = 58278592512. Its totient is φ = 6233184000.

The previous prime is 21717418379. The next prime is 21717418427. The reversal of 21717418404 is 40481471712.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135864 + ... + 248784.

It is an arithmetic number, because the mean of its divisors is an integer number (607068672).

Almost surely, 2^21717418404 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 21717418404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29139296256).

21717418404 is an abundant number, since it is smaller than the sum of its proper divisors (36561174108).

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

21717418404 is a wasteful number, since it uses less digits than its factorization.

21717418404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113017 (or 113015 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 39.

The spelling of 21717418404 in words is "twenty-one billion, seven hundred seventeen million, four hundred eighteen thousand, four hundred four".