21536320212266 has 8 divisors (see below), whose sum is σ = 32306711488320. Its totient is φ = 10767416382828.

The previous prime is 21536320212263. The next prime is 21536320212301. The reversal of 21536320212266 is 66221202363512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21536320212263) 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, 371825456 + ... + 371883371.

It is an arithmetic number, because the mean of its divisors is an integer number (4038338936040).

Almost surely, 2^{21536320212266} is an apocalyptic number.

21536320212266 is a deficient number, since it is larger than the sum of its proper divisors (10770391276054).

21536320212266 is a wasteful number, since it uses less digits than its factorization.

21536320212266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743723308.

The product of its (nonzero) digits is 311040, while the sum is 41.

Adding to 21536320212266 its reverse (66221202363512), we get a palindrome (87757522575778).

The spelling of 21536320212266 in words is "twenty-one trillion, five hundred thirty-six billion, three hundred twenty million, two hundred twelve thousand, two hundred sixty-six".