21468228 has 24 divisors (see below), whose sum is σ = 50167488. Its totient is φ = 7145376.

The previous prime is 21468217. The next prime is 21468247. The reversal of 21468228 is 82286412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14950 + ... + 16322.

It is an arithmetic number, because the mean of its divisors is an integer number (2090312).

Almost surely, 2^21468228 is an apocalyptic number.

It is an amenable number.

21468228 is an abundant number, since it is smaller than the sum of its proper divisors (28699260).

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

21468228 is a wasteful number, since it uses less digits than its factorization.

21468228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683 (or 2681 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 21468228 is about 4633.3819182105. The cubic root of 21468228 is about 277.9278490536.

The spelling of 21468228 in words is "twenty-one million, four hundred sixty-eight thousand, two hundred twenty-eight".