13111231212205 has 32 divisors (see below), whose sum is σ = 18386522740224. Its totient is φ = 8789080525056.

The previous prime is 13111231212203. The next prime is 13111231212223. The reversal of 13111231212205 is 50221213211131.

It is a cyclic number.

It is not a de Polignac number, because 13111231212205 - 2¹ = 13111231212203 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13111231212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111231212203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12244377 + ... + 13272046.

It is an arithmetic number, because the mean of its divisors is an integer number (574578835632).

Almost surely, 2^{13111231212205} is an apocalyptic number.

It is an amenable number.

13111231212205 is a deficient number, since it is larger than the sum of its proper divisors (5275291528019).

13111231212205 is a wasteful number, since it uses less digits than its factorization.

13111231212205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25516765.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 13111231212205 its reverse (50221213211131), we get a palindrome (63332444423336).

The spelling of 13111231212205 in words is "thirteen trillion, one hundred eleven billion, two hundred thirty-one million, two hundred twelve thousand, two hundred five".