21730409166 has 64 divisors (see below), whose sum is σ = 45756057600. Its totient is φ = 6870864000.

The previous prime is 21730409153. The next prime is 21730409201. The reversal of 21730409166 is 66190403712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2297475 + ... + 2306913.

It is an arithmetic number, because the mean of its divisors is an integer number (714938400).

Almost surely, 2^21730409166 is an apocalyptic number.

21730409166 is an abundant number, since it is smaller than the sum of its proper divisors (24025648434).

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

21730409166 is a wasteful number, since it uses less digits than its factorization.

21730409166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9705.

The product of its (nonzero) digits is 54432, while the sum is 39.

The spelling of 21730409166 in words is "twenty-one billion, seven hundred thirty million, four hundred nine thousand, one hundred sixty-six".