121128235181 has 2 divisors, whose sum is σ = 121128235182. Its totient is φ = 121128235180.

The previous prime is 121128235127. The next prime is 121128235199. The reversal of 121128235181 is 181532821121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121127665156 + 570025 = 348034^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 121128235181 - 2²⁶ = 121061126317 is a prime.

It is a super-2 number, since 2×121128235181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121128135181) 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, 60564117590 + 60564117591.

It is an arithmetic number, because the mean of its divisors is an integer number (60564117591).

Almost surely, 2^121128235181 is an apocalyptic number.

It is an amenable number.

121128235181 is a deficient number, since it is larger than the sum of its proper divisors (1).

121128235181 is an equidigital number, since it uses as much as digits as its factorization.

121128235181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 35.

The spelling of 121128235181 in words is "one hundred twenty-one billion, one hundred twenty-eight million, two hundred thirty-five thousand, one hundred eighty-one".