13311121313231 has 4 divisors (see below), whose sum is σ = 15212710072272. Its totient is φ = 11409532554192.

The previous prime is 13311121313209. The next prime is 13311121313249. The reversal of 13311121313231 is 13231312111331.

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 13311121313231 - 2²² = 13311117118927 is a prime.

It is a super-2 number, since 2×13311121313231² (a number of 27 digits) contains 22 as substring.

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 13311121313231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13311121313531) 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 3 ways as a sum of consecutive naturals, for example, 950794379510 + ... + 950794379523.

It is an arithmetic number, because the mean of its divisors is an integer number (3803177518068).

Almost surely, 2^{13311121313231} is an apocalyptic number.

13311121313231 is a deficient number, since it is larger than the sum of its proper divisors (1901588759041).

13311121313231 is an equidigital number, since it uses as much as digits as its factorization.

13311121313231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901588759040.

The product of its digits is 972, while the sum is 26.

Adding to 13311121313231 its reverse (13231312111331), we get a palindrome (26542433424562).

The spelling of 13311121313231 in words is "thirteen trillion, three hundred eleven billion, one hundred twenty-one million, three hundred thirteen thousand, two hundred thirty-one".