21843330 has 32 divisors (see below), whose sum is σ = 54705024. Its totient is φ = 5571456.

The previous prime is 21843299. The next prime is 21843343. The reversal of 21843330 is 3334812.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21843330.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15139 + ... + 16518.

It is an arithmetic number, because the mean of its divisors is an integer number (1709532).

Almost surely, 2^21843330 is an apocalyptic number.

21843330 is an abundant number, since it is smaller than the sum of its proper divisors (32861694).

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

21843330 is a wasteful number, since it uses less digits than its factorization.

21843330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31690.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21843330 is about 4673.6848417496. The cubic root of 21843330 is about 279.5372031767.

The spelling of 21843330 in words is "twenty-one million, eight hundred forty-three thousand, three hundred thirty".