11111231121 has 4 divisors (see below), whose sum is σ = 14814974832. Its totient is φ = 7407487412.

The previous prime is 11111231119. The next prime is 11111231167. The reversal of 11111231121 is 12113211111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11111231121 - 2¹ = 11111231119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11111231121.

It is not an unprimeable number, because it can be changed into a prime (11111231111) 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, 1851871851 + ... + 1851871856.

It is an arithmetic number, because the mean of its divisors is an integer number (3703743708).

Almost surely, 2^11111231121 is an apocalyptic number.

It is an amenable number.

11111231121 is a deficient number, since it is larger than the sum of its proper divisors (3703743711).

11111231121 is an equidigital number, since it uses as much as digits as its factorization.

11111231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703743710.

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

Adding to 11111231121 its reverse (12113211111), we get a palindrome (23224442232).

The spelling of 11111231121 in words is "eleven billion, one hundred eleven million, two hundred thirty-one thousand, one hundred twenty-one".