21224044 has 12 divisors (see below), whose sum is σ = 37483600. Its totient is φ = 10514448.

The previous prime is 21224023. The next prime is 21224053. The reversal of 21224044 is 44042212.

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 3 ways as a sum of consecutive naturals, for example, 23904 + ... + 24775.

Almost surely, 2^21224044 is an apocalyptic number.

It is an amenable number.

21224044 is a deficient number, since it is larger than the sum of its proper divisors (16259556).

21224044 is a wasteful number, since it uses less digits than its factorization.

21224044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48792 (or 48790 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 21224044 is about 4606.9560449390. The cubic root of 21224044 is about 276.8700924825.

Adding to 21224044 its reverse (44042212), we get a palindrome (65266256).

The spelling of 21224044 in words is "twenty-one million, two hundred twenty-four thousand, forty-four".