21044144312 has 8 divisors (see below), whose sum is σ = 39457770600. Its totient is φ = 10522072152.

The previous prime is 21044144293. The next prime is 21044144327. The reversal of 21044144312 is 21344144012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315259012 + ... + 1315259027.

It is an arithmetic number, because the mean of its divisors is an integer number (4932221325).

Almost surely, 2^21044144312 is an apocalyptic number.

It is an amenable number.

21044144312 is a deficient number, since it is larger than the sum of its proper divisors (18413626288).

21044144312 is a wasteful number, since it uses less digits than its factorization.

21044144312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630518045 (or 2630518041 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21044144312 its reverse (21344144012), we get a palindrome (42388288324).

The spelling of 21044144312 in words is "twenty-one billion, forty-four million, one hundred forty-four thousand, three hundred twelve".