21684718107 has 48 divisors (see below), whose sum is σ = 36262786560. Its totient is φ = 12373062336.

The previous prime is 21684718087. The next prime is 21684718141. The reversal of 21684718107 is 70181748612.

21684718107 is a `hidden beast` number, since 2 + 168 + 471 + 8 + 10 + 7 = 666.

It is not a de Polignac number, because 21684718107 - 2¹⁰ = 21684717083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21684718157) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 708 + ... + 208254.

It is an arithmetic number, because the mean of its divisors is an integer number (755474720).

Almost surely, 2^21684718107 is an apocalyptic number.

21684718107 is a deficient number, since it is larger than the sum of its proper divisors (14578068453).

21684718107 is a wasteful number, since it uses less digits than its factorization.

21684718107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207632 (or 207629 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The spelling of 21684718107 in words is "twenty-one billion, six hundred eighty-four million, seven hundred eighteen thousand, one hundred seven".