21244304712 has 64 divisors (see below), whose sum is σ = 55032975360. Its totient is φ = 6826881600.

The previous prime is 21244304707. The next prime is 21244304759. The reversal of 21244304712 is 21740344212.

It is a self number, because there is not a number n which added to its sum of digits gives 21244304712.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141387 + ... + 249957.

It is an arithmetic number, because the mean of its divisors is an integer number (859890240).

Almost surely, 2^21244304712 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 21244304712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27516487680).

21244304712 is an abundant number, since it is smaller than the sum of its proper divisors (33788670648).

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

21244304712 is a wasteful number, since it uses less digits than its factorization.

21244304712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108874 (or 108870 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

Adding to 21244304712 its reverse (21740344212), we get a palindrome (42984648924).

The spelling of 21244304712 in words is "twenty-one billion, two hundred forty-four million, three hundred four thousand, seven hundred twelve".