21204468 has 36 divisors (see below), whose sum is σ = 53752608. Its totient is φ = 7048080.

The previous prime is 21204451. The next prime is 21204487. The reversal of 21204468 is 86440212.

21204468 is a `hidden beast` number, since 212 + 0 + 446 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 17523 + ... + 18693.

It is an arithmetic number, because the mean of its divisors is an integer number (1493128).

Almost surely, 2^21204468 is an apocalyptic number.

It is an amenable number.

21204468 is an abundant number, since it is smaller than the sum of its proper divisors (32548140).

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

21204468 is a wasteful number, since it uses less digits than its factorization.

21204468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684 (or 1679 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 21204468 is about 4604.8309415222. The cubic root of 21204468 is about 276.7849425747.

The spelling of 21204468 in words is "twenty-one million, two hundred four thousand, four hundred sixty-eight".