13212313011221 has 16 divisors (see below), whose sum is σ = 14226732183168. Its totient is φ = 12225244416000.

The previous prime is 13212313011203. The next prime is 13212313011229. The reversal of 13212313011221 is 12211031321231.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13212313011221 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 (13212313011229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15078755 + ... + 15930896.

It is an arithmetic number, because the mean of its divisors is an integer number (889170761448).

Almost surely, 2^{13212313011221} is an apocalyptic number.

It is an amenable number.

13212313011221 is a deficient number, since it is larger than the sum of its proper divisors (1014419171947).

13212313011221 is a wasteful number, since it uses less digits than its factorization.

13212313011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31010092.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 13212313011221 its reverse (12211031321231), we get a palindrome (25423344332452).

The spelling of 13212313011221 in words is "thirteen trillion, two hundred twelve billion, three hundred thirteen million, eleven thousand, two hundred twenty-one".