21113014244 has 72 divisors (see below), whose sum is σ = 44667342720. Its totient is φ = 8552604672.

The previous prime is 21113014201. The next prime is 21113014253. The reversal of 21113014244 is 44241031112.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 4920452 + ... + 4924740.

It is an arithmetic number, because the mean of its divisors is an integer number (620379760).

Almost surely, 2^21113014244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21113014244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22333671360).

21113014244 is an abundant number, since it is smaller than the sum of its proper divisors (23554328476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21113014244 is a wasteful number, since it uses less digits than its factorization.

21113014244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4825 (or 4804 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21113014244 its reverse (44241031112), we get a palindrome (65354045356).

The spelling of 21113014244 in words is "twenty-one billion, one hundred thirteen million, fourteen thousand, two hundred forty-four".