121201212221 has 2 divisors, whose sum is σ = 121201212222. Its totient is φ = 121201212220.

The previous prime is 121201212203. The next prime is 121201212247. The reversal of 121201212221 is 122212102121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121200763321 + 448900 = 348139^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 121201212221 - 2⁶ = 121201212157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121201212221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121201212721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600606110 + 60600606111.

It is an arithmetic number, because the mean of its divisors is an integer number (60600606111).

Almost surely, 2^121201212221 is an apocalyptic number.

It is an amenable number.

121201212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201212221 is an equidigital number, since it uses as much as digits as its factorization.

121201212221 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 17.

Adding to 121201212221 its reverse (122212102121), we get a palindrome (243413314342).

The spelling of 121201212221 in words is "one hundred twenty-one billion, two hundred one million, two hundred twelve thousand, two hundred twenty-one".