11112211111211 has 16 divisors (see below), whose sum is σ = 12784514116608. Its totient is φ = 9461126484000.

The previous prime is 11112211111189. The next prime is 11112211111219. The reversal of 11112211111211 is 11211111221111.

It is a happy number.

11112211111211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11112211111211 - 2²² = 11112206916907 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 11112211111211.

It is not an unprimeable number, because it can be changed into a prime (11112211111219) 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, 18501041 + ... + 19092221.

It is an arithmetic number, because the mean of its divisors is an integer number (799032132288).

Almost surely, 2^{11112211111211} is an apocalyptic number.

11112211111211 is a deficient number, since it is larger than the sum of its proper divisors (1672303005397).

11112211111211 is a wasteful number, since it uses less digits than its factorization.

11112211111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609122.

The product of its digits is 8, while the sum is 17.

Adding to 11112211111211 its reverse (11211111221111), we get a palindrome (22323322332322).

The spelling of 11112211111211 in words is "eleven trillion, one hundred twelve billion, two hundred eleven million, one hundred eleven thousand, two hundred eleven".