11505346121 has 4 divisors (see below), whose sum is σ = 11524115652. Its totient is φ = 11486576592.

The previous prime is 11505346109. The next prime is 11505346123. The reversal of 11505346121 is 12164350511.

11505346121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12164350511 = 223 ⋅54548657.

It can be written as a sum of positive squares in 2 ways, for example, as 2684379721 + 8820966400 = 51811^2 + 93920^2 .

It is a cyclic number.

It is not a de Polignac number, because 11505346121 - 2⁶ = 11505346057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11505346123) 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 3 ways as a sum of consecutive naturals, for example, 9383846 + ... + 9385071.

It is an arithmetic number, because the mean of its divisors is an integer number (2881028913).

Almost surely, 2^11505346121 is an apocalyptic number.

It is an amenable number.

11505346121 is a deficient number, since it is larger than the sum of its proper divisors (18769531).

11505346121 is an equidigital number, since it uses as much as digits as its factorization.

11505346121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18769530.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 11505346121 its reverse (12164350511), we get a palindrome (23669696632).

The spelling of 11505346121 in words is "eleven billion, five hundred five million, three hundred forty-six thousand, one hundred twenty-one".