21672605168 has 10 divisors (see below), whose sum is σ = 41990672544. Its totient is φ = 10836302576.

The previous prime is 21672605131. The next prime is 21672605183. The reversal of 21672605168 is 86150627612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677268896 + ... + 677268927.

Almost surely, 2^21672605168 is an apocalyptic number.

It is an amenable number.

21672605168 is a deficient number, since it is larger than the sum of its proper divisors (20318067376).

21672605168 is a wasteful number, since it uses less digits than its factorization.

21672605168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354537831 (or 1354537825 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 21672605168 in words is "twenty-one billion, six hundred seventy-two million, six hundred five thousand, one hundred sixty-eight".