11121111231 has 8 divisors (see below), whose sum is σ = 14831003904. Its totient is φ = 7412646360.

The previous prime is 11121111173. The next prime is 11121111247. The reversal of 11121111231 is 13211112111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11121111231 - 2⁶ = 11121111167 is a prime.

It is a super-2 number, since 2×11121111231² (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 11121111231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121111251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338641 + ... + 370026.

It is an arithmetic number, because the mean of its divisors is an integer number (1853875488).

Almost surely, 2^11121111231 is an apocalyptic number.

11121111231 is a deficient number, since it is larger than the sum of its proper divisors (3709892673).

11121111231 is an equidigital number, since it uses as much as digits as its factorization.

11121111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713901.

The product of its digits is 12, while the sum is 15.

Adding to 11121111231 its reverse (13211112111), we get a palindrome (24332223342).

The spelling of 11121111231 in words is "eleven billion, one hundred twenty-one million, one hundred eleven thousand, two hundred thirty-one".