11231113123 has 4 divisors (see below), whose sum is σ = 11822224360. Its totient is φ = 10640001888.

The previous prime is 11231113081. The next prime is 11231113133. The reversal of 11231113123 is 32131113211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11231113123 - 2¹³ = 11231104931 is a prime.

It is a super-2 number, since 2×11231113123² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 591111217 = 11231113123 / (1 + 1 + 2 + 3 + 1 + 1 + 1 + 3 + 1 + 2 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11231113123.

It is not an unprimeable number, because it can be changed into a prime (11231113133) 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, 295555590 + ... + 295555627.

It is an arithmetic number, because the mean of its divisors is an integer number (2955556090).

Almost surely, 2^11231113123 is an apocalyptic number.

11231113123 is a deficient number, since it is larger than the sum of its proper divisors (591111237).

11231113123 is an equidigital number, since it uses as much as digits as its factorization.

11231113123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591111236.

The product of its digits is 108, while the sum is 19.

Adding to 11231113123 its reverse (32131113211), we get a palindrome (43362226334).

The spelling of 11231113123 in words is "eleven billion, two hundred thirty-one million, one hundred thirteen thousand, one hundred twenty-three".