12111011011 has 4 divisors (see below), whose sum is σ = 13212012024. Its totient is φ = 11010010000.

The previous prime is 12111010999. The next prime is 12111011041. The reversal of 12111011011 is 11011011121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11011011121 = 11 ⋅1001001011.

It is not a de Polignac number, because 12111011011 - 2⁵ = 12111010979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111011041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550500490 + ... + 550500511.

It is an arithmetic number, because the mean of its divisors is an integer number (3303003006).

Almost surely, 2^12111011011 is an apocalyptic number.

12111011011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12111011011 is a deficient number, since it is larger than the sum of its proper divisors (1101001013).

12111011011 is a wasteful number, since it uses less digits than its factorization.

12111011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101001012.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 12111011011 its reverse (11011011121), we get a palindrome (23122022132).

It can be divided in two parts, 121 and 11011011, that multiplied together give a palindrome (1332332331).

The spelling of 12111011011 in words is "twelve billion, one hundred eleven million, eleven thousand, eleven".