21730049889 has 32 divisors (see below), whose sum is σ = 29855347200. Its totient is φ = 14051712000.

The previous prime is 21730049879. The next prime is 21730049987. The reversal of 21730049889 is 98894003712.

It is not a de Polignac number, because 21730049889 - 2⁵ = 21730049857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21730049879) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 12625549 + ... + 12627269.

It is an arithmetic number, because the mean of its divisors is an integer number (932979600).

Almost surely, 2^21730049889 is an apocalyptic number.

It is an amenable number.

21730049889 is a deficient number, since it is larger than the sum of its proper divisors (8125297311).

21730049889 is a wasteful number, since it uses less digits than its factorization.

21730049889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521.

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 21730049889 in words is "twenty-one billion, seven hundred thirty million, forty-nine thousand, eight hundred eighty-nine".