121221022220117 has 2 divisors, whose sum is σ = 121221022220118. Its totient is φ = 121221022220116.

The previous prime is 121221022220047. The next prime is 121221022220131. The reversal of 121221022220117 is 711022220122121.

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., 92628324658321 + 28592697561796 = 9624361^2 + 5347214^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221022220117 - 2¹⁴ = 121221022203733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221025220117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (37) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610511110058 + 60610511110059.

It is an arithmetic number, because the mean of its divisors is an integer number (60610511110059).

Almost surely, 2^{121221022220117} is an apocalyptic number.

It is an amenable number.

121221022220117 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221022220117 is an equidigital number, since it uses as much as digits as its factorization.

121221022220117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 121221022220117 its reverse (711022220122121), we get a palindrome (832243242342238).

The spelling of 121221022220117 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-two million, two hundred twenty thousand, one hundred seventeen".