21585275804 has 6 divisors (see below), whose sum is σ = 37774232664. Its totient is φ = 10792637900.

The previous prime is 21585275791. The next prime is 21585275813. The reversal of 21585275804 is 40857258512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2698159472 + ... + 2698159479.

It is an arithmetic number, because the mean of its divisors is an integer number (6295705444).

Almost surely, 2^21585275804 is an apocalyptic number.

It is an amenable number.

21585275804 is a deficient number, since it is larger than the sum of its proper divisors (16188956860).

21585275804 is a wasteful number, since it uses less digits than its factorization.

21585275804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5396318955 (or 5396318953 counting only the distinct ones).

The product of its (nonzero) digits is 896000, while the sum is 47.

The spelling of 21585275804 in words is "twenty-one billion, five hundred eighty-five million, two hundred seventy-five thousand, eight hundred four".