21660365332036 has 6 divisors (see below), whose sum is σ = 37905639331070. Its totient is φ = 10830182666016.

The previous prime is 21660365332033. The next prime is 21660365332129. The reversal of 21660365332036 is 63023356306612.

It can be written as a sum of positive squares in only one way, i.e., 19889762522436 + 1770602809600 = 4459794^2 + 1330640^2 .

It is not an unprimeable number, because it can be changed into a prime (21660365332031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2707545666501 + ... + 2707545666508.

Almost surely, 2^{21660365332036} is an apocalyptic number.

It is an amenable number.

21660365332036 is a deficient number, since it is larger than the sum of its proper divisors (16245273999034).

21660365332036 is a wasteful number, since it uses less digits than its factorization.

21660365332036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5415091333013 (or 5415091333011 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 46.

The spelling of 21660365332036 in words is "twenty-one trillion, six hundred sixty billion, three hundred sixty-five million, three hundred thirty-two thousand, thirty-six".