121122201221221 has 2 divisors, whose sum is σ = 121122201221222. Its totient is φ = 121122201221220.

The previous prime is 121122201221173. The next prime is 121122201221233. The reversal of 121122201221221 is 122122102221121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96591824796996 + 24530376424225 = 9828114^2 + 4952815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121122201221221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121122201221192 and 121122201221201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121122201221291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60561100610610 + 60561100610611.

It is an arithmetic number, because the mean of its divisors is an integer number (60561100610611).

Almost surely, 2^{121122201221221} is an apocalyptic number.

It is an amenable number.

121122201221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121122201221221 is an equidigital number, since it uses as much as digits as its factorization.

121122201221221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 121122201221221 its reverse (122122102221121), we get a palindrome (243244303442342).

The spelling of 121122201221221 in words is "one hundred twenty-one trillion, one hundred twenty-two billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-one".