11311211121 has 16 divisors (see below), whose sum is σ = 17251708800. Its totient is φ = 6457707648.

The previous prime is 11311211083. The next prime is 11311211129. The reversal of 11311211121 is 12111211311.

It is not a de Polignac number, because 11311211121 - 2¹¹ = 11311209073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11311211121.

It is not an unprimeable number, because it can be changed into a prime (11311211129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219556 + ... + 266133.

It is an arithmetic number, because the mean of its divisors is an integer number (1078231800).

Almost surely, 2^11311211121 is an apocalyptic number.

It is an amenable number.

11311211121 is a deficient number, since it is larger than the sum of its proper divisors (5940497679).

11311211121 is a wasteful number, since it uses less digits than its factorization.

11311211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486808.

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

Adding to 11311211121 its reverse (12111211311), we get a palindrome (23422422432).

The spelling of 11311211121 in words is "eleven billion, three hundred eleven million, two hundred eleven thousand, one hundred twenty-one".