121312311 has 16 divisors (see below), whose sum is σ = 165656064. Its totient is φ = 78931584.

The previous prime is 121312297. The next prime is 121312339. The reversal of 121312311 is 113213121.

It is a happy number.

It is not a de Polignac number, because 121312311 - 2⁷ = 121312183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121312361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60060 + ... + 62046.

It is an arithmetic number, because the mean of its divisors is an integer number (10353504).

Almost surely, 2^121312311 is an apocalyptic number.

121312311 is a deficient number, since it is larger than the sum of its proper divisors (44343753).

121312311 is a wasteful number, since it uses less digits than its factorization.

121312311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470.

The product of its digits is 36, while the sum is 15.

The square root of 121312311 is about 11014.1868061151. The cubic root of 121312311 is about 495.0339207445.

Adding to 121312311 its reverse (113213121), we get a palindrome (234525432).

The spelling of 121312311 in words is "one hundred twenty-one million, three hundred twelve thousand, three hundred eleven".