11510520121 has 4 divisors (see below), whose sum is σ = 11513841700. Its totient is φ = 11507198544.

The previous prime is 11510520097. The next prime is 11510520127. The reversal of 11510520121 is 12102501511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12102501511 = 5659 ⋅2138629.

It can be written as a sum of positive squares in 2 ways, for example, as 481319721 + 11029200400 = 21939^2 + 105020^2 .

It is a cyclic number.

It is not a de Polignac number, because 11510520121 - 2¹¹ = 11510518073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11510520127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655586 + ... + 1662523.

It is an arithmetic number, because the mean of its divisors is an integer number (2878460425).

Almost surely, 2^11510520121 is an apocalyptic number.

It is an amenable number.

11510520121 is a deficient number, since it is larger than the sum of its proper divisors (3321579).

11510520121 is an equidigital number, since it uses as much as digits as its factorization.

11510520121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321578.

The product of its (nonzero) digits is 100, while the sum is 19.

The spelling of 11510520121 in words is "eleven billion, five hundred ten million, five hundred twenty thousand, one hundred twenty-one".