1111111211 has 12 divisors (see below), whose sum is σ = 1368548568. Its totient is φ = 896357952.

The previous prime is 1111111181. The next prime is 1111111213. The reversal of 1111111211 is 1121111111.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1111111211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111111192 and 1111111201.

It is not an unprimeable number, because it can be changed into a prime (1111111213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 666101 + ... + 667766.

It is an arithmetic number, because the mean of its divisors is an integer number (114045714).

Almost surely, 2^1111111211 is an apocalyptic number.

1111111211 is a deficient number, since it is larger than the sum of its proper divisors (257437357).

1111111211 is a wasteful number, since it uses less digits than its factorization.

1111111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333898 (or 1333891 counting only the distinct ones).

The product of its digits is 2, while the sum is 11.

The square root of 1111111211 is about 33333.3348316666. The cubic root of 1111111211 is about 1035.7441996891.

Adding to 1111111211 its reverse (1121111111), we get a palindrome (2232222322).

It can be divided in two parts, 11111 and 11211, that multiplied together give a palindrome (124565421).

The spelling of 1111111211 in words is "one billion, one hundred eleven million, one hundred eleven thousand, two hundred eleven".