11523434121 has 6 divisors (see below), whose sum is σ = 16644960410. Its totient is φ = 7682289408.

The previous prime is 11523434081. The next prime is 11523434141. The reversal of 11523434121 is 12143432511.

11523434121 is a `hidden beast` number, since 1 + 15 + 234 + 3 + 412 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9050858496 + 2472575625 = 95136^2 + 49725^2 .

It is not a de Polignac number, because 11523434121 - 2⁷ = 11523433993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11523434141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 640190776 + ... + 640190793.

Almost surely, 2^11523434121 is an apocalyptic number.

It is an amenable number.

11523434121 is a deficient number, since it is larger than the sum of its proper divisors (5121526289).

11523434121 is a wasteful number, since it uses less digits than its factorization.

11523434121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280381575 (or 1280381572 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

Adding to 11523434121 its reverse (12143432511), we get a palindrome (23666866632).

The spelling of 11523434121 in words is "eleven billion, five hundred twenty-three million, four hundred thirty-four thousand, one hundred twenty-one".