21685830186 has 16 divisors (see below), whose sum is σ = 45257385024. Its totient is φ = 6914322624.

The previous prime is 21685830151. The next prime is 21685830307. The reversal of 21685830186 is 68103858612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78571711 + ... + 78571986.

It is an arithmetic number, because the mean of its divisors is an integer number (2828586564).

Almost surely, 2^21685830186 is an apocalyptic number.

21685830186 is an abundant number, since it is smaller than the sum of its proper divisors (23571554838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21685830186 is a wasteful number, since it uses less digits than its factorization.

21685830186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157143725.

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 21685830186 in words is "twenty-one billion, six hundred eighty-five million, eight hundred thirty thousand, one hundred eighty-six".