11231203123 has 12 divisors (see below), whose sum is σ = 13067361720. Its totient is φ = 9624908832.

The previous prime is 11231203111. The next prime is 11231203133. The reversal of 11231203123 is 32130213211.

It is not a de Polignac number, because 11231203123 - 2⁵ = 11231203091 is a prime.

It is a super-2 number, since 2×11231203123² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11231203123.

It is not an unprimeable number, because it can be changed into a prime (11231203133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 279540 + ... + 317182.

It is an arithmetic number, because the mean of its divisors is an integer number (1088946810).

Almost surely, 2^11231203123 is an apocalyptic number.

11231203123 is a deficient number, since it is larger than the sum of its proper divisors (1836158597).

11231203123 is an equidigital number, since it uses as much as digits as its factorization.

11231203123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43746 (or 43739 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 11231203123 its reverse (32130213211), we get a palindrome (43361416334).

The spelling of 11231203123 in words is "eleven billion, two hundred thirty-one million, two hundred three thousand, one hundred twenty-three".