21684374182 has 8 divisors (see below), whose sum is σ = 32527187352. Its totient is φ = 10841978400.

The previous prime is 21684374149. The next prime is 21684374197. The reversal of 21684374182 is 28147348612.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139582 + ... + 250702.

It is an arithmetic number, because the mean of its divisors is an integer number (4065898419).

Almost surely, 2^21684374182 is an apocalyptic number.

21684374182 is a deficient number, since it is larger than the sum of its proper divisors (10842813170).

21684374182 is a wasteful number, since it uses less digits than its factorization.

21684374182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208694.

The product of its digits is 516096, while the sum is 46.

The spelling of 21684374182 in words is "twenty-one billion, six hundred eighty-four million, three hundred seventy-four thousand, one hundred eighty-two".