21044504144 has 20 divisors (see below), whose sum is σ = 40776321696. Its totient is φ = 10521582432.

The previous prime is 21044504141. The next prime is 21044504179. The reversal of 21044504144 is 44140544012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044504141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304037 + ... + 366779.

Almost surely, 2^21044504144 is an apocalyptic number.

It is an amenable number.

21044504144 is a deficient number, since it is larger than the sum of its proper divisors (19731817552).

21044504144 is a wasteful number, since it uses less digits than its factorization.

21044504144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83714 (or 83708 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 29.

The spelling of 21044504144 in words is "twenty-one billion, forty-four million, five hundred four thousand, one hundred forty-four".