121242101221 has 2 divisors, whose sum is σ = 121242101222. Its totient is φ = 121242101220.

The previous prime is 121242101191. The next prime is 121242101249. The reversal of 121242101221 is 122101242121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83051170596 + 38190930625 = 288186^2 + 195425^2 .

It is a cyclic number.

It is not a de Polignac number, because 121242101221 - 2⁷ = 121242101093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121242101251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60621050610 + 60621050611.

It is an arithmetic number, because the mean of its divisors is an integer number (60621050611).

Almost surely, 2^121242101221 is an apocalyptic number.

It is an amenable number.

121242101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121242101221 is an equidigital number, since it uses as much as digits as its factorization.

121242101221 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 121242101221 its reverse (122101242121), we get a palindrome (243343343342).

The spelling of 121242101221 in words is "one hundred twenty-one billion, two hundred forty-two million, one hundred one thousand, two hundred twenty-one".