21003221113244 has 12 divisors (see below), whose sum is σ = 36755995223304. Its totient is φ = 10501508192304.

The previous prime is 21003221113243. The next prime is 21003221113267. The reversal of 21003221113244 is 44231112230012.

It is a happy number.

It is a super-3 number, since 3×21003221113244³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003221113243) 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 in 3 ways as a sum of consecutive naturals, for example, 25128494 + ... + 25950869.

It is an arithmetic number, because the mean of its divisors is an integer number (3062999601942).

Almost surely, 2^{21003221113244} is an apocalyptic number.

It is an amenable number.

21003221113244 is a deficient number, since it is larger than the sum of its proper divisors (15752774110060).

21003221113244 is a wasteful number, since it uses less digits than its factorization.

21003221113244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51182164 (or 51182162 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21003221113244 its reverse (44231112230012), we get a palindrome (65234333343256).

The spelling of 21003221113244 in words is "twenty-one trillion, three billion, two hundred twenty-one million, one hundred thirteen thousand, two hundred forty-four".