11123311121 has 12 divisors (see below), whose sum is σ = 12107865600. Its totient is φ = 10213884720.

The previous prime is 11123311103. The next prime is 11123311207. The reversal of 11123311121 is 12111332111.

It is not a de Polignac number, because 11123311121 - 2²² = 11119116817 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 11123311121.

It is not an unprimeable number, because it can be changed into a prime (11123311921) 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, 140021 + ... + 204578.

It is an arithmetic number, because the mean of its divisors is an integer number (1008988800).

Almost surely, 2^11123311121 is an apocalyptic number.

It is an amenable number.

11123311121 is a deficient number, since it is larger than the sum of its proper divisors (984554479).

11123311121 is a wasteful number, since it uses less digits than its factorization.

11123311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344816 (or 344803 counting only the distinct ones).

The product of its digits is 36, while the sum is 17.

Adding to 11123311121 its reverse (12111332111), we get a palindrome (23234643232).

The spelling of 11123311121 in words is "eleven billion, one hundred twenty-three million, three hundred eleven thousand, one hundred twenty-one".