21822208 has 18 divisors (see below), whose sum is σ = 43559684. Its totient is φ = 10910976.

The previous prime is 21822197. The next prime is 21822217. The reversal of 21822208 is 80222812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42366 + ... + 42877.

Almost surely, 2^21822208 is an apocalyptic number.

It is an amenable number.

21822208 is a deficient number, since it is larger than the sum of its proper divisors (21737476).

21822208 is an frugal number, since it uses more digits than its factorization.

21822208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85259 (or 85245 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 21822208 is about 4671.4246221041. The cubic root of 21822208 is about 279.4470720938.

The spelling of 21822208 in words is "twenty-one million, eight hundred twenty-two thousand, two hundred eight".