21440230444 has 12 divisors (see below), whose sum is σ = 37534282744. Its totient is φ = 10716149664.

The previous prime is 21440230423. The next prime is 21440230457. The reversal of 21440230444 is 44403204412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 979209 + ... + 1000864.

Almost surely, 2^21440230444 is an apocalyptic number.

It is an amenable number.

21440230444 is a deficient number, since it is larger than the sum of its proper divisors (16094052300).

21440230444 is a wasteful number, since it uses less digits than its factorization.

21440230444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982784 (or 1982782 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21440230444 its reverse (44403204412), we get a palindrome (65843434856).

The spelling of 21440230444 in words is "twenty-one billion, four hundred forty million, two hundred thirty thousand, four hundred forty-four".