12212279 has 2 divisors, whose sum is σ = 12212280. Its totient is φ = 12212278.

The previous prime is 12212237. The next prime is 12212293. The reversal of 12212279 is 97221221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12212279 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106139 + 6106140.

It is an arithmetic number, because the mean of its divisors is an integer number (6106140).

Almost surely, 2^12212279 is an apocalyptic number.

12212279 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212279 is an equidigital number, since it uses as much as digits as its factorization.

12212279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 12212279 is about 3494.6071309948. The cubic root of 12212279 is about 230.2849587136.

The spelling of 12212279 in words is "twelve million, two hundred twelve thousand, two hundred seventy-nine".