21730445966 has 16 divisors (see below), whose sum is σ = 33440302224. Its totient is φ = 10587265344.

The previous prime is 21730445953. The next prime is 21730446007. The reversal of 21730445966 is 66954403712.

It is a self number, because there is not a number n which added to its sum of digits gives 21730445966.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 884501 + ... + 908736.

It is an arithmetic number, because the mean of its divisors is an integer number (2090018889).

Almost surely, 2^21730445966 is an apocalyptic number.

21730445966 is a deficient number, since it is larger than the sum of its proper divisors (11709856258).

21730445966 is a wasteful number, since it uses less digits than its factorization.

21730445966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793395.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 21730445966 in words is "twenty-one billion, seven hundred thirty million, four hundred forty-five thousand, nine hundred sixty-six".