121128311 has 2 divisors, whose sum is σ = 121128312. Its totient is φ = 121128310.

The previous prime is 121128299. The next prime is 121128313. The reversal of 121128311 is 113821121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121128311 - 2²⁶ = 54019447 is a prime.

Together with 121128313, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121128313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60564155 + 60564156.

It is an arithmetic number, because the mean of its divisors is an integer number (60564156).

Almost surely, 2^121128311 is an apocalyptic number.

121128311 is a deficient number, since it is larger than the sum of its proper divisors (1).

121128311 is an equidigital number, since it uses as much as digits as its factorization.

121128311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 20.

The square root of 121128311 is about 11005.8307728222. The cubic root of 121128311 is about 494.7835138098.

Adding to 121128311 its reverse (113821121), we get a palindrome (234949432).

The spelling of 121128311 in words is "one hundred twenty-one million, one hundred twenty-eight thousand, three hundred eleven".