21766764533 has 8 divisors (see below), whose sum is σ = 21981468288. Its totient is φ = 21552125904.

The previous prime is 21766764527. The next prime is 21766764559. The reversal of 21766764533 is 33546766712.

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 21766764533 - 2⁸ = 21766764277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21766764433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 916616 + ... + 940062.

It is an arithmetic number, because the mean of its divisors is an integer number (2747683536).

Almost surely, 2^21766764533 is an apocalyptic number.

It is an amenable number.

21766764533 is a deficient number, since it is larger than the sum of its proper divisors (214703755).

21766764533 is a wasteful number, since it uses less digits than its factorization.

21766764533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32563.

The product of its digits is 3810240, while the sum is 50.

The spelling of 21766764533 in words is "twenty-one billion, seven hundred sixty-six million, seven hundred sixty-four thousand, five hundred thirty-three".