21482216 has 16 divisors (see below), whose sum is σ = 46033440. Its totient is φ = 9206640.

The previous prime is 21482191. The next prime is 21482239. The reversal of 21482216 is 61228412.

It is a happy number.

It is a super-2 number, since 2×21482216² = 922971208541312, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191750 + ... + 191861.

It is an arithmetic number, because the mean of its divisors is an integer number (2877090).

Almost surely, 2^21482216 is an apocalyptic number.

It is an amenable number.

21482216 is an abundant number, since it is smaller than the sum of its proper divisors (24551224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21482216 is a wasteful number, since it uses less digits than its factorization.

21482216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383624 (or 383620 counting only the distinct ones).

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

The square root of 21482216 is about 4634.8911529830. The cubic root of 21482216 is about 277.9881988676.

The spelling of 21482216 in words is "twenty-one million, four hundred eighty-two thousand, two hundred sixteen".