21684718106 has 8 divisors (see below), whose sum is σ = 32528304000. Its totient is φ = 10841950108.

The previous prime is 21684718087. The next prime is 21684718141. The reversal of 21684718106 is 60181748612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133226 + ... + 247221.

It is an arithmetic number, because the mean of its divisors is an integer number (4066038000).

Almost surely, 2^21684718106 is an apocalyptic number.

21684718106 is a deficient number, since it is larger than the sum of its proper divisors (10843585894).

21684718106 is a wasteful number, since it uses less digits than its factorization.

21684718106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408948.

The product of its (nonzero) digits is 129024, while the sum is 44.

It can be divided in two parts, 2168 and 4718106, that added together give a palindrome (4720274).

The spelling of 21684718106 in words is "twenty-one billion, six hundred eighty-four million, seven hundred eighteen thousand, one hundred six".