121221021221117 has 2 divisors, whose sum is σ = 121221021221118. Its totient is φ = 121221021221116.

The previous prime is 121221021221093. The next prime is 121221021221123. The reversal of 121221021221117 is 711122120122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120725727600676 + 495293620441 = 10987526^2 + 703771^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221021221117 - 2¹⁶ = 121221021155581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221021221197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610510610558 + 60610510610559.

It is an arithmetic number, because the mean of its divisors is an integer number (60610510610559).

Almost surely, 2^{121221021221117} is an apocalyptic number.

It is an amenable number.

121221021221117 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221021221117 is an equidigital number, since it uses as much as digits as its factorization.

121221021221117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 26.

Adding to 121221021221117 its reverse (711122120122121), we get a palindrome (832343141343238).

The spelling of 121221021221117 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, one hundred seventeen".