21745717058 has 30 divisors (see below), whose sum is σ = 35394059661. Its totient is φ = 10020218208.

The previous prime is 21745717043. The next prime is 21745717061. The reversal of 21745717058 is 85071754712.

21745717058 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 21085072849 + 660644209 = 145207^2 + 25703^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=104273.

It is a Duffinian 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 in 14 ways as a sum of consecutive naturals, for example, 35243966 + ... + 35244582.

Almost surely, 2^21745717058 is an apocalyptic number.

21745717058 is a deficient number, since it is larger than the sum of its proper divisors (13648342603).

21745717058 is an frugal number, since it uses more digits than its factorization.

21745717058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 548800, while the sum is 47.

The spelling of 21745717058 in words is "twenty-one billion, seven hundred forty-five million, seven hundred seventeen thousand, fifty-eight".