12011211221111 has 2 divisors, whose sum is σ = 12011211221112. Its totient is φ = 12011211221110.

The previous prime is 12011211221101. The next prime is 12011211221117. The reversal of 12011211221111 is 11112211211021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12011211221111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12011211221111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12011211221117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005605610555 + 6005605610556.

It is an arithmetic number, because the mean of its divisors is an integer number (6005605610556).

Almost surely, 2^{12011211221111} is an apocalyptic number.

12011211221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011211221111 is an equidigital number, since it uses as much as digits as its factorization.

12011211221111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12011211221111 its reverse (11112211211021), we get a palindrome (23123422432132).

The spelling of 12011211221111 in words is "twelve trillion, eleven billion, two hundred eleven million, two hundred twenty-one thousand, one hundred eleven".