21766133091 has 8 divisors (see below), whose sum is σ = 29025876240. Its totient is φ = 14508572672.

The previous prime is 21766133087. The next prime is 21766133093. The reversal of 21766133091 is 19033166712.

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

It is a cyclic number.

It is not a de Polignac number, because 21766133091 - 2² = 21766133087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21766133093) by changing a digit.

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, 522270 + ... + 562403.

It is an arithmetic number, because the mean of its divisors is an integer number (3628234530).

Almost surely, 2^21766133091 is an apocalyptic number.

21766133091 is a deficient number, since it is larger than the sum of its proper divisors (7259743149).

21766133091 is a wasteful number, since it uses less digits than its factorization.

21766133091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091365.

The product of its (nonzero) digits is 40824, while the sum is 39.

The spelling of 21766133091 in words is "twenty-one billion, seven hundred sixty-six million, one hundred thirty-three thousand, ninety-one".