11523311121 has 128 divisors (see below), whose sum is σ = 19859374080. Its totient is φ = 5793182208.

The previous prime is 11523311119. The next prime is 11523311209. The reversal of 11523311121 is 12111332511.

It is not a de Polignac number, because 11523311121 - 2¹ = 11523311119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

11523311121 is a modest number, since divided by 311121 gives 11523 as remainder.

It is not an unprimeable number, because it can be changed into a prime (11523311321) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 69001780 + ... + 69001946.

It is an arithmetic number, because the mean of its divisors is an integer number (155151360).

Almost surely, 2^11523311121 is an apocalyptic number.

It is an amenable number.

11523311121 is a deficient number, since it is larger than the sum of its proper divisors (8336062959).

11523311121 is a wasteful number, since it uses less digits than its factorization.

11523311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395.

The product of its digits is 180, while the sum is 21.

Adding to 11523311121 its reverse (12111332511), we get a palindrome (23634643632).

The spelling of 11523311121 in words is "eleven billion, five hundred twenty-three million, three hundred eleven thousand, one hundred twenty-one".