21544844512 has 12 divisors (see below), whose sum is σ = 42416412696. Its totient is φ = 10772422240.

The previous prime is 21544844507. The next prime is 21544844537.

It is a happy number.

21544844512 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336638164 + ... + 336638227.

It is an arithmetic number, because the mean of its divisors is an integer number (3534701058).

Almost surely, 2^21544844512 is an apocalyptic number.

It is an amenable number.

21544844512 is a deficient number, since it is larger than the sum of its proper divisors (20871568184).

21544844512 is an equidigital number, since it uses as much as digits as its factorization.

21544844512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673276401 (or 673276393 counting only the distinct ones).

The product of its digits is 204800, while the sum is 40.

The spelling of 21544844512 in words is "twenty-one billion, five hundred forty-four million, eight hundred forty-four thousand, five hundred twelve".