11211211121 has 16 divisors (see below), whose sum is σ = 12314658048. Its totient is φ = 10122051600.

The previous prime is 11211211111. The next prime is 11211211147. The reversal of 11211211121 is 12111211211.

It is a cyclic number.

It is not a de Polignac number, because 11211211121 - 2¹⁰ = 11211210097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211211096 and 11211211105.

It is not an unprimeable number, because it can be changed into a prime (11211211111) 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, 949826 + ... + 961556.

It is an arithmetic number, because the mean of its divisors is an integer number (769666128).

Almost surely, 2^11211211121 is an apocalyptic number.

11211211121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11211211121 is a deficient number, since it is larger than the sum of its proper divisors (1103446927).

11211211121 is a wasteful number, since it uses less digits than its factorization.

11211211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12332.

The product of its digits is 8, while the sum is 14.

Adding to 11211211121 its reverse (12111211211), we get a palindrome (23322422332).

It can be divided in two parts, 11211211 and 121, that multiplied together give a palindrome (1356556531).

The spelling of 11211211121 in words is "eleven billion, two hundred eleven million, two hundred eleven thousand, one hundred twenty-one".