21086168 has 16 divisors (see below), whose sum is σ = 40456680. Its totient is φ = 10297728.

The previous prime is 21086141. The next prime is 21086179. The reversal of 21086168 is 86168012.

It is a congruent number.

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, 30305 + ... + 30992.

Almost surely, 2^21086168 is an apocalyptic number.

It is an amenable number.

21086168 is a deficient number, since it is larger than the sum of its proper divisors (19370512).

21086168 is a wasteful number, since it uses less digits than its factorization.

21086168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61346 (or 61342 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 21086168 is about 4591.9677699217. The cubic root of 21086168 is about 276.2692534508.

The spelling of 21086168 in words is "twenty-one million, eighty-six thousand, one hundred sixty-eight".