21184484 has 6 divisors (see below), whose sum is σ = 37072854. Its totient is φ = 10592240.

The previous prime is 21184469. The next prime is 21184511. The reversal of 21184484 is 48448112.

It can be written as a sum of positive squares in only one way, i.e., 13118884 + 8065600 = 3622^2 + 2840^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21184484.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2648057 + ... + 2648064.

It is an arithmetic number, because the mean of its divisors is an integer number (6178809).

Almost surely, 2^21184484 is an apocalyptic number.

It is an amenable number.

21184484 is a deficient number, since it is larger than the sum of its proper divisors (15888370).

21184484 is a wasteful number, since it uses less digits than its factorization.

21184484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5296125 (or 5296123 counting only the distinct ones).

The product of its digits is 8192, while the sum is 32.

The square root of 21184484 is about 4602.6605349515. The cubic root of 21184484 is about 276.6979639116.

The spelling of 21184484 in words is "twenty-one million, one hundred eighty-four thousand, four hundred eighty-four".