21552268 has 12 divisors (see below), whose sum is σ = 37761472. Its totient is φ = 10763280.

The previous prime is 21552257. The next prime is 21552269. The reversal of 21552268 is 86225512.

It is not an unprimeable number, because it can be changed into a prime (21552269) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1246 + ... + 6682.

Almost surely, 2^21552268 is an apocalyptic number.

It is an amenable number.

21552268 is a deficient number, since it is larger than the sum of its proper divisors (16209204).

21552268 is a wasteful number, since it uses less digits than its factorization.

21552268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432 (or 6430 counting only the distinct ones).

The product of its digits is 9600, while the sum is 31.

The square root of 21552268 is about 4642.4420297942. The cubic root of 21552268 is about 278.2900376877.

The spelling of 21552268 in words is "twenty-one million, five hundred fifty-two thousand, two hundred sixty-eight".