211201111121111 has 2 divisors, whose sum is σ = 211201111121112. Its totient is φ = 211201111121110.

The previous prime is 211201111121081. The next prime is 211201111121167. The reversal of 211201111121111 is 111121111102112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211201111121111 - 2¹⁴ = 211201111104727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211201111121111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211201113121111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105600555560555 + 105600555560556.

It is an arithmetic number, because the mean of its divisors is an integer number (105600555560556).

Almost surely, 2^{211201111121111} is an apocalyptic number.

211201111121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

211201111121111 is an equidigital number, since it uses as much as digits as its factorization.

211201111121111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 211201111121111 its reverse (111121111102112), we get a palindrome (322322222223223).

The spelling of 211201111121111 in words is "two hundred eleven trillion, two hundred one billion, one hundred eleven million, one hundred twenty-one thousand, one hundred eleven".