21422168 has 16 divisors (see below), whose sum is σ = 40475160. Its totient is φ = 10628800.

The previous prime is 21422143. The next prime is 21422221. The reversal of 21422168 is 86122412.

It is a happy number.

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, 9173 + ... + 11268.

Almost surely, 2^21422168 is an apocalyptic number.

It is an amenable number.

21422168 is a deficient number, since it is larger than the sum of its proper divisors (19052992).

21422168 is a wasteful number, since it uses less digits than its factorization.

21422168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20578 (or 20574 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 21422168 is about 4628.4087978483. The cubic root of 21422168 is about 277.7289423601.

The spelling of 21422168 in words is "twenty-one million, four hundred twenty-two thousand, one hundred sixty-eight".