21004000244 has 12 divisors (see below), whose sum is σ = 36758120868. Its totient is φ = 10501680000.

The previous prime is 21004000229. The next prime is 21004000261. The reversal of 21004000244 is 44200040012.

It can be written as a sum of positive squares in 2 ways, for example, as 7270972900 + 13733027344 = 85270^2 + 117188^2 .

It is a congruent number.

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, 127244 + ... + 241244.

It is an arithmetic number, because the mean of its divisors is an integer number (3063176739).

Almost surely, 2^21004000244 is an apocalyptic number.

It is an amenable number.

21004000244 is a deficient number, since it is larger than the sum of its proper divisors (15754120624).

21004000244 is a wasteful number, since it uses less digits than its factorization.

21004000244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160066 (or 160064 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21004000244 its reverse (44200040012), we get a palindrome (65204040256).

The spelling of 21004000244 in words is "twenty-one billion, four million, two hundred forty-four", and thus it is an aban number.