121216113 has 6 divisors (see below), whose sum is σ = 175089954. Its totient is φ = 80810736.

The previous prime is 121216111. The next prime is 121216129. The reversal of 121216113 is 311612121.

It can be written as a sum of positive squares in only one way, i.e., 120626289 + 589824 = 10983^2 + 768^2 .

It is not a de Polignac number, because 121216113 - 2¹ = 121216111 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121216111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6734220 + ... + 6734237.

It is an arithmetic number, because the mean of its divisors is an integer number (29181659).

Almost surely, 2^121216113 is an apocalyptic number.

It is an amenable number.

121216113 is a deficient number, since it is larger than the sum of its proper divisors (53873841).

121216113 is a wasteful number, since it uses less digits than its factorization.

121216113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13468463 (or 13468460 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 121216113 is about 11009.8189358409. The cubic root of 121216113 is about 494.9030357975.

Adding to 121216113 its reverse (311612121), we get a palindrome (432828234).

The spelling of 121216113 in words is "one hundred twenty-one million, two hundred sixteen thousand, one hundred thirteen".