21587675859 has 6 divisors (see below), whose sum is σ = 31182198476. Its totient is φ = 14391783900.

The previous prime is 21587675843. The next prime is 21587675897. The reversal of 21587675859 is 95857678512.

It is not a de Polignac number, because 21587675859 - 2⁴ = 21587675843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21587675796 and 21587675805.

It is not an unprimeable number, because it can be changed into a prime (21587675819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1199315317 + ... + 1199315334.

Almost surely, 2^21587675859 is an apocalyptic number.

21587675859 is a deficient number, since it is larger than the sum of its proper divisors (9594522617).

21587675859 is a wasteful number, since it uses less digits than its factorization.

21587675859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398630657 (or 2398630654 counting only the distinct ones).

The product of its digits is 42336000, while the sum is 63.

The spelling of 21587675859 in words is "twenty-one billion, five hundred eighty-seven million, six hundred seventy-five thousand, eight hundred fifty-nine".