11321311121 has 2 divisors, whose sum is σ = 11321311122. Its totient is φ = 11321311120.

The previous prime is 11321311087. The next prime is 11321311153. The reversal of 11321311121 is 12111312311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5739577600 + 5581733521 = 75760^2 + 74711^2 .

It is a cyclic number.

It is not a de Polignac number, because 11321311121 - 2²² = 11317116817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11321311121.

It is not a weakly prime, because it can be changed into another prime (11321311921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5660655560 + 5660655561.

It is an arithmetic number, because the mean of its divisors is an integer number (5660655561).

Almost surely, 2^11321311121 is an apocalyptic number.

It is an amenable number.

11321311121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11321311121 is an equidigital number, since it uses as much as digits as its factorization.

11321311121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 17.

Adding to 11321311121 its reverse (12111312311), we get a palindrome (23432623432).

The spelling of 11321311121 in words is "eleven billion, three hundred twenty-one million, three hundred eleven thousand, one hundred twenty-one".