121218113 has 2 divisors, whose sum is σ = 121218114. Its totient is φ = 121218112.

The previous prime is 121218107. The next prime is 121218127. The reversal of 121218113 is 311812121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118635664 + 2582449 = 10892^2 + 1607^2 .

It is an emirp because it is prime and its reverse (311812121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121218113 - 2¹² = 121214017 is a prime.

It is not a weakly prime, because it can be changed into another prime (121218103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60609056 + 60609057.

It is an arithmetic number, because the mean of its divisors is an integer number (60609057).

Almost surely, 2^121218113 is an apocalyptic number.

It is an amenable number.

121218113 is a deficient number, since it is larger than the sum of its proper divisors (1).

121218113 is an equidigital number, since it uses as much as digits as its factorization.

121218113 is an evil number, because the sum of its binary digits is even.

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

The square root of 121218113 is about 11009.9097634813. The cubic root of 121218113 is about 494.9057576596.

The spelling of 121218113 in words is "one hundred twenty-one million, two hundred eighteen thousand, one hundred thirteen".