121220102102161 has 2 divisors, whose sum is σ = 121220102102162. Its totient is φ = 121220102102160.

The previous prime is 121220102102123. The next prime is 121220102102233. The reversal of 121220102102161 is 161201201022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86628718577025 + 34591383525136 = 9307455^2 + 5881444^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220102102161 - 2⁴¹ = 119021078846609 is a prime.

It is not a weakly prime, because it can be changed into another prime (121220102103161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610051051080 + 60610051051081.

It is an arithmetic number, because the mean of its divisors is an integer number (60610051051081).

Almost surely, 2^{121220102102161} is an apocalyptic number.

It is an amenable number.

121220102102161 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220102102161 is an equidigital number, since it uses as much as digits as its factorization.

121220102102161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 121220102102161 its reverse (161201201022121), we get a palindrome (282421303124282).

The spelling of 121220102102161 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred two million, one hundred two thousand, one hundred sixty-one".