12212121121111 has 2 divisors, whose sum is σ = 12212121121112. Its totient is φ = 12212121121110.

The previous prime is 12212121121051. The next prime is 12212121121169. The reversal of 12212121121111 is 11112112121221.

12212121121111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (11112112121221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12212121121111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212121121511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106060560555 + 6106060560556.

It is an arithmetic number, because the mean of its divisors is an integer number (6106060560556).

Almost surely, 2^{12212121121111} is an apocalyptic number.

12212121121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212121121111 is an equidigital number, since it uses as much as digits as its factorization.

12212121121111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32, while the sum is 19.

Adding to 12212121121111 its reverse (11112112121221), we get a palindrome (23324233242332).

The spelling of 12212121121111 in words is "twelve trillion, two hundred twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred eleven".