11111011121 has 12 divisors (see below), whose sum is σ = 13605320880. Its totient is φ = 9022474440.

The previous prime is 11111011117. The next prime is 11111011123. The reversal of 11111011121 is 12111011111.

It is a happy number.

It is not a de Polignac number, because 11111011121 - 2² = 11111011117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11111011123) 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, 5966315 + ... + 5968176.

It is an arithmetic number, because the mean of its divisors is an integer number (1133776740).

Almost surely, 2^11111011121 is an apocalyptic number.

It is an amenable number.

11111011121 is a deficient number, since it is larger than the sum of its proper divisors (2494309759).

11111011121 is a wasteful number, since it uses less digits than its factorization.

11111011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11934524 (or 11934517 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11111011121 its reverse (12111011111), we get a palindrome (23222022232).

The spelling of 11111011121 in words is "eleven billion, one hundred eleven million, eleven thousand, one hundred twenty-one".