121118151816121 has 2 divisors, whose sum is σ = 121118151816122. Its totient is φ = 121118151816120.

The previous prime is 121118151816119. The next prime is 121118151816127. The reversal of 121118151816121 is 121618151811121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66078608765625 + 55039543050496 = 8128875^2 + 7418864^2 .

It is a cyclic number.

It is not a de Polignac number, because 121118151816121 - 2¹ = 121118151816119 is a prime.

Together with 121118151816119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121118151816127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60559075908060 + 60559075908061.

It is an arithmetic number, because the mean of its divisors is an integer number (60559075908061).

Almost surely, 2^{121118151816121} is an apocalyptic number.

It is an amenable number.

121118151816121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121118151816121 is an equidigital number, since it uses as much as digits as its factorization.

121118151816121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 40.

The spelling of 121118151816121 in words is "one hundred twenty-one trillion, one hundred eighteen billion, one hundred fifty-one million, eight hundred sixteen thousand, one hundred twenty-one".