21216223133323 has 4 divisors (see below), whose sum is σ = 21371086076040. Its totient is φ = 21061360190608.

The previous prime is 21216223133317. The next prime is 21216223133341. The reversal of 21216223133323 is 32333132261212.

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 21216223133323 - 2¹³ = 21216223125131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21216223133353) 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, 77431471153 + ... + 77431471426.

It is an arithmetic number, because the mean of its divisors is an integer number (5342771519010).

Almost surely, 2^{21216223133323} is an apocalyptic number.

21216223133323 is a deficient number, since it is larger than the sum of its proper divisors (154862942717).

21216223133323 is a wasteful number, since it uses less digits than its factorization.

21216223133323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154862942716.

The product of its digits is 46656, while the sum is 34.

Adding to 21216223133323 its reverse (32333132261212), we get a palindrome (53549355394535).

The spelling of 21216223133323 in words is "twenty-one trillion, two hundred sixteen billion, two hundred twenty-three million, one hundred thirty-three thousand, three hundred twenty-three".