1212111131111 has 2 divisors, whose sum is σ = 1212111131112. Its totient is φ = 1212111131110.

The previous prime is 1212111131089. The next prime is 1212111131123. The reversal of 1212111131111 is 1111311112121.

It is a m-pointer prime, because the next prime (1212111131123) can be obtained adding 1212111131111 to its product of digits (12).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212111131111 - 2⁶ = 1212111131047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212111131111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212111131611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606055565555 + 606055565556.

It is an arithmetic number, because the mean of its divisors is an integer number (606055565556).

Almost surely, 2^{1212111131111} is an apocalyptic number.

1212111131111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212111131111 is an equidigital number, since it uses as much as digits as its factorization.

1212111131111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12, while the sum is 17.

Adding to 1212111131111 its reverse (1111311112121), we get a palindrome (2323422243232).

The spelling of 1212111131111 in words is "one trillion, two hundred twelve billion, one hundred eleven million, one hundred thirty-one thousand, one hundred eleven".