11111231123311 has 24 divisors (see below), whose sum is σ = 13612203465840. Its totient is φ = 9006570650880.

The previous prime is 11111231123309. The next prime is 11111231123371. The reversal of 11111231123311 is 11332113211111.

It is a happy number.

It is not a de Polignac number, because 11111231123311 - 2¹ = 11111231123309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111231123371) 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, 142110076 + ... + 142188241.

It is an arithmetic number, because the mean of its divisors is an integer number (567175144410).

Almost surely, 2^{11111231123311} is an apocalyptic number.

11111231123311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11111231123311 is a deficient number, since it is larger than the sum of its proper divisors (2500972342529).

11111231123311 is a wasteful number, since it uses less digits than its factorization.

11111231123311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284298375 (or 284298364 counting only the distinct ones).

The product of its digits is 108, while the sum is 22.

Adding to 11111231123311 its reverse (11332113211111), we get a palindrome (22443344334422).

The spelling of 11111231123311 in words is "eleven trillion, one hundred eleven billion, two hundred thirty-one million, one hundred twenty-three thousand, three hundred eleven".