21444204 has 24 divisors (see below), whose sum is σ = 50434048. Its totient is φ = 7091280.

The previous prime is 21444193. The next prime is 21444223. The reversal of 21444204 is 40244412.

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 7 ways as a sum of consecutive naturals, for example, 5512 + ... + 8559.

Almost surely, 2^21444204 is an apocalyptic number.

It is an amenable number.

21444204 is an abundant number, since it is smaller than the sum of its proper divisors (28989844).

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

21444204 is a wasteful number, since it uses less digits than its factorization.

21444204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14205 (or 14203 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 21444204 is about 4630.7887017224. The cubic root of 21444204 is about 277.8241387271.

Adding to 21444204 its reverse (40244412), we get a palindrome (61688616).

The spelling of 21444204 in words is "twenty-one million, four hundred forty-four thousand, two hundred four".