21444794608 has 20 divisors (see below), whose sum is σ = 42889590208. Its totient is φ = 10376513280.

The previous prime is 21444794597. The next prime is 21444794621. The reversal of 21444794608 is 80649744412.

21444794608 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21617241 + ... + 21618232.

Almost surely, 2^21444794608 is an apocalyptic number.

It is an amenable number.

21444794608 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21444794608 is a wasteful number, since it uses less digits than its factorization.

21444794608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43235512 (or 43235506 counting only the distinct ones).

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

The spelling of 21444794608 in words is "twenty-one billion, four hundred forty-four million, seven hundred ninety-four thousand, six hundred eight".