21822256 has 10 divisors (see below), whose sum is σ = 42280652. Its totient is φ = 10911120.

The previous prime is 21822223. The next prime is 21822287. The reversal of 21822256 is 65222812.

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 as a sum of consecutive naturals, namely, 681930 + ... + 681961.

Almost surely, 2^21822256 is an apocalyptic number.

It is an amenable number.

21822256 is a deficient number, since it is larger than the sum of its proper divisors (20458396).

21822256 is a wasteful number, since it uses less digits than its factorization.

21822256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363899 (or 1363893 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 21822256 is about 4671.4297597203. The cubic root of 21822256 is about 279.4472769837.

The spelling of 21822256 in words is "twenty-one million, eight hundred twenty-two thousand, two hundred fifty-six".