1210111121111 has 2 divisors, whose sum is σ = 1210111121112. Its totient is φ = 1210111121110.

The previous prime is 1210111121081. The next prime is 1210111121117. The reversal of 1210111121111 is 1111211110121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210111121111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210111121117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605055560555 + 605055560556.

It is an arithmetic number, because the mean of its divisors is an integer number (605055560556).

Almost surely, 2^{1210111121111} is an apocalyptic number.

1210111121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210111121111 is an equidigital number, since it uses as much as digits as its factorization.

1210111121111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 1210111121111 its reverse (1111211110121), we get a palindrome (2321322231232).

The spelling of 1210111121111 in words is "one trillion, two hundred ten billion, one hundred eleven million, one hundred twenty-one thousand, one hundred eleven".