11111111211 has 16 divisors (see below), whose sum is σ = 15232619808. Its totient is φ = 7198963200.

The previous prime is 11111111159. The next prime is 11111111237. The reversal of 11111111211 is 11211111111.

It is not a de Polignac number, because 11111111211 - 2¹³ = 11111103019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11111111611) 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, 40981 + ... + 154601.

It is an arithmetic number, because the mean of its divisors is an integer number (952038738).

Almost surely, 2^11111111211 is an apocalyptic number.

11111111211 is a deficient number, since it is larger than the sum of its proper divisors (4121508597).

11111111211 is a wasteful number, since it uses less digits than its factorization.

11111111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114542.

The product of its digits is 2, while the sum is 12.

Adding to 11111111211 its reverse (11211111111), we get a palindrome (22322222322).

It can be divided in two parts, 111111 and 11211, that multiplied together give a palindrome (1245665421).

The spelling of 11111111211 in words is "eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred eleven".