21487368585 has 16 divisors (see below), whose sum is σ = 35111275776. Its totient is φ = 11216101248.

The previous prime is 21487368571. The next prime is 21487368607. The reversal of 21487368585 is 58586378412.

It is not a de Polignac number, because 21487368585 - 2⁶ = 21487368521 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15238564 + ... + 15239973.

It is an arithmetic number, because the mean of its divisors is an integer number (2194454736).

Almost surely, 2^21487368585 is an apocalyptic number.

It is an amenable number.

21487368585 is a deficient number, since it is larger than the sum of its proper divisors (13623907191).

21487368585 is a wasteful number, since it uses less digits than its factorization.

21487368585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30478592.

The product of its digits is 12902400, while the sum is 57.

The spelling of 21487368585 in words is "twenty-one billion, four hundred eighty-seven million, three hundred sixty-eight thousand, five hundred eighty-five".