21469216 has 24 divisors (see below), whose sum is σ = 42444864. Its totient is φ = 10689600.

The previous prime is 21469207. The next prime is 21469247. The reversal of 21469216 is 61296412.

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, 7141 + ... + 9691.

It is an arithmetic number, because the mean of its divisors is an integer number (1768536).

Almost surely, 2^21469216 is an apocalyptic number.

It is an amenable number.

21469216 is a deficient number, since it is larger than the sum of its proper divisors (20975648).

21469216 is a wasteful number, since it uses less digits than its factorization.

21469216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824 (or 2816 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 21469216 is about 4633.4885345709. The cubic root of 21469216 is about 277.9321125401.

The spelling of 21469216 in words is "twenty-one million, four hundred sixty-nine thousand, two hundred sixteen".