21382116766 has 8 divisors (see below), whose sum is σ = 32073847344. Its totient is φ = 10690834320.

The previous prime is 21382116737. The next prime is 21382116779. The reversal of 21382116766 is 66761128312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60226 + ... + 215386.

It is an arithmetic number, because the mean of its divisors is an integer number (4009230918).

Almost surely, 2^21382116766 is an apocalyptic number.

21382116766 is a deficient number, since it is larger than the sum of its proper divisors (10691730578).

21382116766 is a wasteful number, since it uses less digits than its factorization.

21382116766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224066.

The product of its digits is 145152, while the sum is 43.

The spelling of 21382116766 in words is "twenty-one billion, three hundred eighty-two million, one hundred sixteen thousand, seven hundred sixty-six".