12111111101 has 2 divisors, whose sum is σ = 12111111102. Its totient is φ = 12111111100.

The previous prime is 12111111097. The next prime is 12111111113. The reversal of 12111111101 is 10111111121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9422584900 + 2688526201 = 97070^2 + 51851^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111111101 - 2² = 12111111097 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111111601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055555550 + 6055555551.

It is an arithmetic number, because the mean of its divisors is an integer number (6055555551).

Almost surely, 2^12111111101 is an apocalyptic number.

It is an amenable number.

12111111101 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111111101 is an equidigital number, since it uses as much as digits as its factorization.

12111111101 is an odious number, because the sum of its binary digits is odd.

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

Adding to 12111111101 its reverse (10111111121), we get a palindrome (22222222222).

The spelling of 12111111101 in words is "twelve billion, one hundred eleven million, one hundred eleven thousand, one hundred one".