12121110111 has 32 divisors (see below), whose sum is σ = 17766217728. Its totient is φ = 7289792640.

The previous prime is 12121110061. The next prime is 12121110137. The reversal of 12121110111 is 11101112121.

It is not a de Polignac number, because 12121110111 - 2¹³ = 12121101919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121110151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7734450 + ... + 7736016.

It is an arithmetic number, because the mean of its divisors is an integer number (555194304).

Almost surely, 2^12121110111 is an apocalyptic number.

12121110111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12121110111 is a deficient number, since it is larger than the sum of its proper divisors (5645107617).

12121110111 is a wasteful number, since it uses less digits than its factorization.

12121110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 12121110111 its reverse (11101112121), we get a palindrome (23222222232).

The spelling of 12121110111 in words is "twelve billion, one hundred twenty-one million, one hundred ten thousand, one hundred eleven".