121020111620173 has 2 divisors, whose sum is σ = 121020111620174. Its totient is φ = 121020111620172.

The previous prime is 121020111620137. The next prime is 121020111620179. The reversal of 121020111620173 is 371026111020121.

Together with previous prime (121020111620137) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82356115050729 + 38663996569444 = 9075027^2 + 6218038^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020111620173 - 2¹³ = 121020111611981 is a prime.

It is a super-3 number, since 3×121020111620173³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121020111620179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510055810086 + 60510055810087.

It is an arithmetic number, because the mean of its divisors is an integer number (60510055810087).

Almost surely, 2^{121020111620173} is an apocalyptic number.

It is an amenable number.

121020111620173 is a deficient number, since it is larger than the sum of its proper divisors (1).

121020111620173 is an equidigital number, since it uses as much as digits as its factorization.

121020111620173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

Adding to 121020111620173 its reverse (371026111020121), we get a palindrome (492046222640294).

The spelling of 121020111620173 in words is "one hundred twenty-one trillion, twenty billion, one hundred eleven million, six hundred twenty thousand, one hundred seventy-three".