121221202101161 has 2 divisors, whose sum is σ = 121221202101162. Its totient is φ = 121221202101160.

The previous prime is 121221202101119. The next prime is 121221202101283. The reversal of 121221202101161 is 161101202122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72637778928400 + 48583423172761 = 8522780^2 + 6970181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221202101161 is a prime.

It is not a weakly prime, because it can be changed into another prime (121221202100161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610601050580 + 60610601050581.

It is an arithmetic number, because the mean of its divisors is an integer number (60610601050581).

Almost surely, 2^{121221202101161} is an apocalyptic number.

It is an amenable number.

121221202101161 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221202101161 is an equidigital number, since it uses as much as digits as its factorization.

121221202101161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 23.

Adding to 121221202101161 its reverse (161101202122121), we get a palindrome (282322404223282).

The spelling of 121221202101161 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, one hundred one thousand, one hundred sixty-one".