12858685821 has 32 divisors (see below), whose sum is σ = 19509776640. Its totient is φ = 8367912000.

The previous prime is 12858685799. The next prime is 12858685823.

12858685821 is a `hidden beast` number, since 1 + 2 + 8 + 58 + 6 + 8 + 582 + 1 = 666.

12858685821 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-12858685821 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12858685823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160411 + ... + 226823.

It is an arithmetic number, because the mean of its divisors is an integer number (609680520).

Almost surely, 2^12858685821 is an apocalyptic number.

It is an amenable number.

12858685821 is a deficient number, since it is larger than the sum of its proper divisors (6651090819).

12858685821 is a wasteful number, since it uses less digits than its factorization.

12858685821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66594 (or 66588 counting only the distinct ones).

The product of its digits is 2457600, while the sum is 54.

The spelling of 12858685821 in words is "twelve billion, eight hundred fifty-eight million, six hundred eighty-five thousand, eight hundred twenty-one".