21272685186 has 16 divisors (see below), whose sum is σ = 42696780768. Its totient is φ = 7065660000.

The previous prime is 21272685167. The next prime is 21272685193. The reversal of 21272685186 is 68158627212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6306940 + ... + 6310311.

It is an arithmetic number, because the mean of its divisors is an integer number (2668548798).

Almost surely, 2^21272685186 is an apocalyptic number.

21272685186 is an abundant number, since it is smaller than the sum of its proper divisors (21424095582).

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

21272685186 is a wasteful number, since it uses less digits than its factorization.

21272685186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12617537.

The product of its digits is 645120, while the sum is 48.

The spelling of 21272685186 in words is "twenty-one billion, two hundred seventy-two million, six hundred eighty-five thousand, one hundred eighty-six".