21204048 has 20 divisors (see below), whose sum is σ = 54777248. Its totient is φ = 7068000.

The previous prime is 21204037. The next prime is 21204059. The reversal of 21204048 is 84040212.

It is an interprime number because it is at equal distance from previous prime (21204037) and next prime (21204059).

It is a super-2 number, since 2×21204048² = 899223303172608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220828 + ... + 220923.

Almost surely, 2^21204048 is an apocalyptic number.

It is an amenable number.

21204048 is an abundant number, since it is smaller than the sum of its proper divisors (33573200).

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

21204048 is a wasteful number, since it uses less digits than its factorization.

21204048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441762 (or 441756 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 21204048 is about 4604.7853370163. The cubic root of 21204048 is about 276.7831151227.

The spelling of 21204048 in words is "twenty-one million, two hundred four thousand, forty-eight".