21684448612 has 12 divisors (see below), whose sum is σ = 37976391040. Its totient is φ = 10834051176.

The previous prime is 21684448579. The next prime is 21684448627.

21684448612 is nontrivially palindromic in base 10.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

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, 2037312 + ... + 2047927.

Almost surely, 2^21684448612 is an apocalyptic number.

It is an amenable number.

21684448612 is a deficient number, since it is larger than the sum of its proper divisors (16291942428).

21684448612 is a wasteful number, since it uses less digits than its factorization.

21684448612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086570 (or 4086568 counting only the distinct ones).

The product of its digits is 589824, while the sum is 46.

The spelling of 21684448612 in words is "twenty-one billion, six hundred eighty-four million, four hundred forty-eight thousand, six hundred twelve".