21944867044 has 27 divisors (see below), whose sum is σ = 40804797243. Its totient is φ = 10324626048.

The previous prime is 21944867029. The next prime is 21944867051. The reversal of 21944867044 is 44076844912.

The square root of 21944867044 is 148138.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 16522017444 + 5422849600 = 128538^2 + 73640^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5034514 + ... + 5038870.

Almost surely, 2^21944867044 is an apocalyptic number.

21944867044 is the 148138-th square number.

It is an amenable number.

21944867044 is a deficient number, since it is larger than the sum of its proper divisors (18859930199).

21944867044 is an frugal number, since it uses more digits than its factorization.

21944867044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8752 (or 4376 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 49.

Multiplying 21944867044 by its sum of digits (49), we get a square (1075298485156 = 1036966²).

The spelling of 21944867044 in words is "twenty-one billion, nine hundred forty-four million, eight hundred sixty-seven thousand, forty-four".