21241440244 has 6 divisors (see below), whose sum is σ = 37172520434. Its totient is φ = 10620720120.

The previous prime is 21241440229. The next prime is 21241440247. The reversal of 21241440244 is 44204414212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20067555600 + 1173884644 = 141660^2 + 34262^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241440247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2655180027 + ... + 2655180034.

Almost surely, 2^21241440244 is an apocalyptic number.

It is an amenable number.

21241440244 is a deficient number, since it is larger than the sum of its proper divisors (15931080190).

21241440244 is a wasteful number, since it uses less digits than its factorization.

21241440244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5310360065 (or 5310360063 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 21241440244 its reverse (44204414212), we get a palindrome (65445854456).

The spelling of 21241440244 in words is "twenty-one billion, two hundred forty-one million, four hundred forty thousand, two hundred forty-four".