11505304121 has 2 divisors, whose sum is σ = 11505304122. Its totient is φ = 11505304120.

The previous prime is 11505304079. The next prime is 11505304171. The reversal of 11505304121 is 12140350511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10420326400 + 1084977721 = 102080^2 + 32939^2 .

It is a cyclic number.

It is not a de Polignac number, because 11505304121 - 2²⁶ = 11438195257 is a prime.

It is not a weakly prime, because it can be changed into another prime (11505304171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5752652060 + 5752652061.

It is an arithmetic number, because the mean of its divisors is an integer number (5752652061).

Almost surely, 2^11505304121 is an apocalyptic number.

It is an amenable number.

11505304121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11505304121 is an equidigital number, since it uses as much as digits as its factorization.

11505304121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 11505304121 its reverse (12140350511), we get a palindrome (23645654632).

The spelling of 11505304121 in words is "eleven billion, five hundred five million, three hundred four thousand, one hundred twenty-one".