12212122211 has 2 divisors, whose sum is σ = 12212122212. Its totient is φ = 12212122210.

The previous prime is 12212122157. The next prime is 12212122213. The reversal of 12212122211 is 11222121221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12212122211 is a prime.

Together with 12212122213, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12212122211.

It is not a weakly prime, because it can be changed into another prime (12212122213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106061105 + 6106061106.

It is an arithmetic number, because the mean of its divisors is an integer number (6106061106).

Almost surely, 2^12212122211 is an apocalyptic number.

12212122211 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212122211 is an equidigital number, since it uses as much as digits as its factorization.

12212122211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64, while the sum is 17.

Adding to 12212122211 its reverse (11222121221), we get a palindrome (23434243432).

The spelling of 12212122211 in words is "twelve billion, two hundred twelve million, one hundred twenty-two thousand, two hundred eleven".