12212012221 has 2 divisors, whose sum is σ = 12212012222. Its totient is φ = 12212012220.

The previous prime is 12212012179. The next prime is 12212012227. The reversal of 12212012221 is 12221021221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11840486596 + 371525625 = 108814^2 + 19275^2 .

It is a cyclic number.

It is not a de Polignac number, because 12212012221 - 2⁷ = 12212012093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12212012195 and 12212012204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12212012227) 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, 6106006110 + 6106006111.

It is an arithmetic number, because the mean of its divisors is an integer number (6106006111).

Almost surely, 2^12212012221 is an apocalyptic number.

It is an amenable number.

12212012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212012221 is an equidigital number, since it uses as much as digits as its factorization.

12212012221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12212012221 its reverse (12221021221), we get a palindrome (24433033442).

The spelling of 12212012221 in words is "twelve billion, two hundred twelve million, twelve thousand, two hundred twenty-one".