21660564550327 has 8 divisors (see below), whose sum is σ = 22188940461072. Its totient is φ = 21132191947200.

The previous prime is 21660564550279. The next prime is 21660564550343. The reversal of 21660564550327 is 72305546506612.

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 21660564550327 - 2²⁷ = 21660430332599 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 (21660564550397) 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, 17127552 + ... + 18348682.

It is an arithmetic number, because the mean of its divisors is an integer number (2773617557634).

Almost surely, 2^{21660564550327} is an apocalyptic number.

21660564550327 is a deficient number, since it is larger than the sum of its proper divisors (528375910745).

21660564550327 is a wasteful number, since it uses less digits than its factorization.

21660564550327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653809.

The product of its (nonzero) digits is 9072000, while the sum is 52.

The spelling of 21660564550327 in words is "twenty-one trillion, six hundred sixty billion, five hundred sixty-four million, five hundred fifty thousand, three hundred twenty-seven".