21686008113 has 48 divisors (see below), whose sum is σ = 39070502016. Its totient is φ = 11260581120.

The previous prime is 21686008087. The next prime is 21686008139. The reversal of 21686008113 is 31180068612.

It is an interprime number because it is at equal distance from previous prime (21686008087) and next prime (21686008139).

It is not a de Polignac number, because 21686008113 - 2¹² = 21686004017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21686008213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2041131 + ... + 2051727.

It is an arithmetic number, because the mean of its divisors is an integer number (813968792).

Almost surely, 2^21686008113 is an apocalyptic number.

It is an amenable number.

21686008113 is a deficient number, since it is larger than the sum of its proper divisors (17384493903).

21686008113 is a wasteful number, since it uses less digits than its factorization.

21686008113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13574 (or 13571 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 21686008113 in words is "twenty-one billion, six hundred eighty-six million, eight thousand, one hundred thirteen".