11121231223 has 4 divisors (see below), whose sum is σ = 11162574360. Its totient is φ = 11079888088.

The previous prime is 11121231217. The next prime is 11121231281. The reversal of 11121231223 is 32213212111.

11121231223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11121231223 is a prime.

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 11121231223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121231623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20671165 + ... + 20671702.

It is an arithmetic number, because the mean of its divisors is an integer number (2790643590).

Almost surely, 2^11121231223 is an apocalyptic number.

11121231223 is a deficient number, since it is larger than the sum of its proper divisors (41343137).

11121231223 is an equidigital number, since it uses as much as digits as its factorization.

11121231223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41343136.

The product of its digits is 144, while the sum is 19.

Adding to 11121231223 its reverse (32213212111), we get a palindrome (43334443334).

The spelling of 11121231223 in words is "eleven billion, one hundred twenty-one million, two hundred thirty-one thousand, two hundred twenty-three".