12011011111 has 4 divisors (see below), whose sum is σ = 13102921224. Its totient is φ = 10919101000.

The previous prime is 12011011099. The next prime is 12011011183. The reversal of 12011011111 is 11111011021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12011011111 - 2³¹ = 9863527463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011041111) 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, 545955040 + ... + 545955061.

It is an arithmetic number, because the mean of its divisors is an integer number (3275730306).

Almost surely, 2^12011011111 is an apocalyptic number.

12011011111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12011011111 is a deficient number, since it is larger than the sum of its proper divisors (1091910113).

12011011111 is a wasteful number, since it uses less digits than its factorization.

12011011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091910112.

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

Adding to 12011011111 its reverse (11111011021), we get a palindrome (23122022132).

The spelling of 12011011111 in words is "twelve billion, eleven million, eleven thousand, one hundred eleven".