121221120169 has 2 divisors, whose sum is σ = 121221120170. Its totient is φ = 121221120168.

The previous prime is 121221120121. The next prime is 121221120187. The reversal of 121221120169 is 961021122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94379212944 + 26841907225 = 307212^2 + 163835^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221120169 - 2¹¹ = 121221118121 is a prime.

It is a super-2 number, since 2×121221120169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121221124169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610560084 + 60610560085.

It is an arithmetic number, because the mean of its divisors is an integer number (60610560085).

Almost surely, 2^121221120169 is an apocalyptic number.

It is an amenable number.

121221120169 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221120169 is an equidigital number, since it uses as much as digits as its factorization.

121221120169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 121221120169 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred sixty-nine".