11111211211 has 8 divisors (see below), whose sum is σ = 11225470464. Its totient is φ = 10997074920.

The previous prime is 11111211179. The next prime is 11111211247. The reversal of 11111211211 is 11211211111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111211211 - 2⁵ = 11111211179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111211191 and 11111211200.

It is not an unprimeable number, because it can be changed into a prime (11111217211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156750 + ... + 216316.

It is an arithmetic number, because the mean of its divisors is an integer number (1403183808).

Almost surely, 2^11111211211 is an apocalyptic number.

11111211211 is a deficient number, since it is larger than the sum of its proper divisors (114259253).

11111211211 is a wasteful number, since it uses less digits than its factorization.

11111211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61481.

The product of its digits is 4, while the sum is 13.

Adding to 11111211211 its reverse (11211211111), we get a palindrome (22322422322).

It can be divided in two parts, 111 and 11211211, that multiplied together give a palindrome (1244444421).

The spelling of 11111211211 in words is "eleven billion, one hundred eleven million, two hundred eleven thousand, two hundred eleven".