21344032 has 24 divisors (see below), whose sum is σ = 42601356. Its totient is φ = 10524672.

The previous prime is 21344021. The next prime is 21344033. The reversal of 21344032 is 23044312.

It can be written as a sum of positive squares in 2 ways, for example, as 19395216 + 1948816 = 4404^2 + 1396^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344033) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2233 + ... + 6904.

Almost surely, 2^21344032 is an apocalyptic number.

It is an amenable number.

21344032 is a deficient number, since it is larger than the sum of its proper divisors (21257324).

21344032 is an equidigital number, since it uses as much as digits as its factorization.

21344032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9220 (or 9212 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 21344032 is about 4619.9601729885. The cubic root of 21344032 is about 277.3908647493.

Adding to 21344032 its reverse (23044312), we get a palindrome (44388344).

The spelling of 21344032 in words is "twenty-one million, three hundred forty-four thousand, thirty-two".