21660630030326 has 32 divisors (see below), whose sum is σ = 37203826452480. Its totient is φ = 9265314754656.

The previous prime is 21660630030323. The next prime is 21660630030331. The reversal of 21660630030326 is 62303003606612.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21660630030326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21660630030323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14552435 + ... + 15971681.

It is an arithmetic number, because the mean of its divisors is an integer number (1162619576640).

Almost surely, 2^{21660630030326} is an apocalyptic number.

21660630030326 is a deficient number, since it is larger than the sum of its proper divisors (15543196422154).

21660630030326 is a wasteful number, since it uses less digits than its factorization.

21660630030326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421348.

The product of its (nonzero) digits is 139968, while the sum is 38.

Adding to 21660630030326 its reverse (62303003606612), we get a palindrome (83963633636938).

The spelling of 21660630030326 in words is "twenty-one trillion, six hundred sixty billion, six hundred thirty million, thirty thousand, three hundred twenty-six".