11500122231 has 32 divisors (see below), whose sum is σ = 18980472000. Its totient is φ = 6832957824.

The previous prime is 11500122203. The next prime is 11500122253. The reversal of 11500122231 is 13222100511.

11500122231 is a `hidden beast` number, since 11 + 500 + 122 + 2 + 31 = 666.

It is not a de Polignac number, because 11500122231 - 2⁶ = 11500122167 is a prime.

It is a super-2 number, since 2×11500122231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11500122031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 554716 + ... + 575073.

It is an arithmetic number, because the mean of its divisors is an integer number (593139750).

Almost surely, 2^11500122231 is an apocalyptic number.

11500122231 is a deficient number, since it is larger than the sum of its proper divisors (7480349769).

11500122231 is a wasteful number, since it uses less digits than its factorization.

11500122231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129840 (or 1129834 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 11500122231 its reverse (13222100511), we get a palindrome (24722222742).

The spelling of 11500122231 in words is "eleven billion, five hundred million, one hundred twenty-two thousand, two hundred thirty-one".