11520121225 has 12 divisors (see below), whose sum is σ = 14287144716. Its totient is φ = 9214681280.

The previous prime is 11520121219. The next prime is 11520121229. The reversal of 11520121225 is 52212102511.

It is a happy number.

11520121225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 13697401 + 11506423824 = 3701^2 + 107268^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11520121225 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11520121196 and 11520121205.

It is not an unprimeable number, because it can be changed into a prime (11520121229) 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 11 ways as a sum of consecutive naturals, for example, 149559 + ... + 213091.

It is an arithmetic number, because the mean of its divisors is an integer number (1190595393).

Almost surely, 2^11520121225 is an apocalyptic number.

It is an amenable number.

11520121225 is a deficient number, since it is larger than the sum of its proper divisors (2767023491).

11520121225 is an equidigital number, since it uses as much as digits as its factorization.

11520121225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70796 (or 70791 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 11520121225 its reverse (52212102511), we get a palindrome (63732223736).

The spelling of 11520121225 in words is "eleven billion, five hundred twenty million, one hundred twenty-one thousand, two hundred twenty-five".