1212212012111 has 2 divisors, whose sum is σ = 1212212012112. Its totient is φ = 1212212012110.

The previous prime is 1212212012107. The next prime is 1212212012147. The reversal of 1212212012111 is 1112102122121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212212012111 - 2² = 1212212012107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212212012111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212212012411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606106006055 + 606106006056.

It is an arithmetic number, because the mean of its divisors is an integer number (606106006056).

Almost surely, 2^{1212212012111} is an apocalyptic number.

1212212012111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212212012111 is an equidigital number, since it uses as much as digits as its factorization.

1212212012111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1212212012111 its reverse (1112102122121), we get a palindrome (2324314134232).

The spelling of 1212212012111 in words is "one trillion, two hundred twelve billion, two hundred twelve million, twelve thousand, one hundred eleven".