21324288 has 40 divisors (see below), whose sum is σ = 56813328. Its totient is φ = 7107584.

The previous prime is 21324287. The next prime is 21324301. The reversal of 21324288 is 88242312.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21324283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5406 + ... + 8477.

Almost surely, 2^21324288 is an apocalyptic number.

It is an amenable number.

21324288 is an abundant number, since it is smaller than the sum of its proper divisors (35489040).

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

21324288 is an equidigital number, since it uses as much as digits as its factorization.

21324288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13904 (or 13888 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 21324288 is about 4617.8228636447. The cubic root of 21324288 is about 277.3053061749.

It can be divided in two parts, 21324 and 288, that added together give a palindrome (21612).

The spelling of 21324288 in words is "twenty-one million, three hundred twenty-four thousand, two hundred eighty-eight".