21585858512 has 10 divisors (see below), whose sum is σ = 41822600898. Its totient is φ = 10792929248.

The previous prime is 21585858509. The next prime is 21585858529.

It is a happy number.

21585858512 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 17565791296 + 4020067216 = 132536^2 + 63404^2 .

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, 674558063 + ... + 674558094.

Almost surely, 2^21585858512 is an apocalyptic number.

It is an amenable number.

21585858512 is a deficient number, since it is larger than the sum of its proper divisors (20236742386).

21585858512 is a wasteful number, since it uses less digits than its factorization.

21585858512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349116165 (or 1349116159 counting only the distinct ones).

The product of its digits is 1280000, while the sum is 50.

The spelling of 21585858512 in words is "twenty-one billion, five hundred eighty-five million, eight hundred fifty-eight thousand, five hundred twelve".