21441344 has 14 divisors (see below), whose sum is σ = 42547794. Its totient is φ = 10720640.

The previous prime is 21441337. The next prime is 21441347. The reversal of 21441344 is 44314412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13601344 + 7840000 = 3688^2 + 2800^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167447 + ... + 167574.

Almost surely, 2^21441344 is an apocalyptic number.

It is an amenable number.

21441344 is a deficient number, since it is larger than the sum of its proper divisors (21106450).

21441344 is an equidigital number, since it uses as much as digits as its factorization.

21441344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335033 (or 335023 counting only the distinct ones).

The product of its digits is 1536, while the sum is 23.

The square root of 21441344 is about 4630.4798887372. The cubic root of 21441344 is about 277.8117871011.

Adding to 21441344 its reverse (44314412), we get a palindrome (65755756).

The spelling of 21441344 in words is "twenty-one million, four hundred forty-one thousand, three hundred forty-four".