21444034244 has 6 divisors (see below), whose sum is σ = 37527059934. Its totient is φ = 10722017120.

The previous prime is 21444034223. The next prime is 21444034247. The reversal of 21444034244 is 44243044412.

It can be written as a sum of positive squares in only one way, i.e., 10991425600 + 10452608644 = 104840^2 + 102238^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21444034244.

It is not an unprimeable number, because it can be changed into a prime (21444034247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2680504277 + ... + 2680504284.

It is an arithmetic number, because the mean of its divisors is an integer number (6254509989).

Almost surely, 2^21444034244 is an apocalyptic number.

It is an amenable number.

21444034244 is a deficient number, since it is larger than the sum of its proper divisors (16083025690).

21444034244 is a wasteful number, since it uses less digits than its factorization.

21444034244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5361008565 (or 5361008563 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 32.

Adding to 21444034244 its reverse (44243044412), we get a palindrome (65687078656).

The spelling of 21444034244 in words is "twenty-one billion, four hundred forty-four million, thirty-four thousand, two hundred forty-four".