1212201221221 has 2 divisors, whose sum is σ = 1212201221222. Its totient is φ = 1212201221220.

The previous prime is 1212201221197. The next prime is 1212201221233. The reversal of 1212201221221 is 1221221022121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1072933430625 + 139267790596 = 1035825^2 + 373186^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212201221221 - 2⁷ = 1212201221093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212201221251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606100610610 + 606100610611.

It is an arithmetic number, because the mean of its divisors is an integer number (606100610611).

Almost surely, 2^{1212201221221} is an apocalyptic number.

It is an amenable number.

1212201221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212201221221 is an equidigital number, since it uses as much as digits as its factorization.

1212201221221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1212201221221 its reverse (1221221022121), we get a palindrome (2433422243342).

The spelling of 1212201221221 in words is "one trillion, two hundred twelve billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-one".