21660562531003 has 4 divisors (see below), whose sum is σ = 23629704579288. Its totient is φ = 19691420482720.

The previous prime is 21660562530961. The next prime is 21660562531009. The reversal of 21660562531003 is 30013526506612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21660562531003 - 2¹³ = 21660562522811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21660562531009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984571024126 + ... + 984571024147.

It is an arithmetic number, because the mean of its divisors is an integer number (5907426144822).

Almost surely, 2^{21660562531003} is an apocalyptic number.

21660562531003 is a deficient number, since it is larger than the sum of its proper divisors (1969142048285).

21660562531003 is a wasteful number, since it uses less digits than its factorization.

21660562531003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969142048284.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 21660562531003 in words is "twenty-one trillion, six hundred sixty billion, five hundred sixty-two million, five hundred thirty-one thousand, three".