16585305021 has 12 divisors (see below), whose sum is σ = 24045613020. Its totient is φ = 11015764800.

The previous prime is 16585304987. The next prime is 16585305047. The reversal of 16585305021 is 12050358561.

It is a happy number.

16585305021 is a `hidden beast` number, since 1 + 6 + 58 + 530 + 50 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8532216900 + 8053088121 = 92370^2 + 89739^2 .

It is not a de Polignac number, because 16585305021 - 2⁹ = 16585304509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16585305091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3422880 + ... + 3427721.

It is an arithmetic number, because the mean of its divisors is an integer number (2003801085).

Almost surely, 2^16585305021 is an apocalyptic number.

It is an amenable number.

16585305021 is a deficient number, since it is larger than the sum of its proper divisors (7460307999).

16585305021 is a wasteful number, since it uses less digits than its factorization.

16585305021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6850876 (or 6850873 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 16585305021 in words is "sixteen billion, five hundred eighty-five million, three hundred five thousand, twenty-one".