21184330 has 8 divisors (see below), whose sum is σ = 38131812. Its totient is φ = 8473728.

The previous prime is 21184327. The next prime is 21184343. The reversal of 21184330 is 3348112.

It can be written as a sum of positive squares in 2 ways, for example, as 21169201 + 15129 = 4601^2 + 123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 1059207 + ... + 1059226.

Almost surely, 2^21184330 is an apocalyptic number.

21184330 is a deficient number, since it is larger than the sum of its proper divisors (16947482).

21184330 is a wasteful number, since it uses less digits than its factorization.

21184330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118440.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21184330 is about 4602.6438054666. The cubic root of 21184330 is about 276.6972934273.

The spelling of 21184330 in words is "twenty-one million, one hundred eighty-four thousand, three hundred thirty".