12212111 has 2 divisors, whose sum is σ = 12212112. Its totient is φ = 12212110.

The previous prime is 12212107. The next prime is 12212113. The reversal of 12212111 is 11121221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12212111 - 2² = 12212107 is a prime.

Together with 12212113, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12212092 and 12212101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106055 + 6106056.

It is an arithmetic number, because the mean of its divisors is an integer number (6106056).

Almost surely, 2^12212111 is an apocalyptic number.

12212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212111 is an equidigital number, since it uses as much as digits as its factorization.

12212111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8, while the sum is 11.

The square root of 12212111 is about 3494.5830938754. The cubic root of 12212111 is about 230.2839027259.

Adding to 12212111 its reverse (11121221), we get a palindrome (23333332).

The spelling of 12212111 in words is "twelve million, two hundred twelve thousand, one hundred eleven".