11203131121 has 24 divisors (see below), whose sum is σ = 14860276200. Its totient is φ = 8342595072.

The previous prime is 11203131113. The next prime is 11203131127. The reversal of 11203131121 is 12113130211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2336272225 + 8866858896 = 48335^2 + 94164^2 .

It is not a de Polignac number, because 11203131121 - 2³ = 11203131113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11203131095 and 11203131104.

It is not an unprimeable number, because it can be changed into a prime (11203131127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 506446 + ... + 528103.

It is an arithmetic number, because the mean of its divisors is an integer number (619178175).

Almost surely, 2^11203131121 is an apocalyptic number.

It is an amenable number.

11203131121 is a deficient number, since it is larger than the sum of its proper divisors (3657145079).

11203131121 is a wasteful number, since it uses less digits than its factorization.

11203131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034593 (or 1034586 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11203131121 its reverse (12113130211), we get a palindrome (23316261332).

The spelling of 11203131121 in words is "eleven billion, two hundred three million, one hundred thirty-one thousand, one hundred twenty-one".