21715860250404 has 18 divisors (see below), whose sum is σ = 54892868966390. Its totient is φ = 7238620083456.

The previous prime is 21715860250369. The next prime is 21715860250433. The reversal of 21715860250404 is 40405206851712.

21715860250404 is a `hidden beast` number, since 2 + 1 + 7 + 1 + 586 + 0 + 25 + 0 + 40 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21501750452004 + 214109798400 = 4636998^2 + 462720^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 21715860250404.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 301609170109 + ... + 301609170180.

Almost surely, 2^{21715860250404} is an apocalyptic number.

It is an amenable number.

21715860250404 is an abundant number, since it is smaller than the sum of its proper divisors (33177008715986).

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

21715860250404 is a wasteful number, since it uses less digits than its factorization.

21715860250404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603218340299 (or 603218340294 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 21715860250404 in words is "twenty-one trillion, seven hundred fifteen billion, eight hundred sixty million, two hundred fifty thousand, four hundred four".