121218239 has 8 divisors (see below), whose sum is σ = 122023440. Its totient is φ = 120416256.

The previous prime is 121218199. The next prime is 121218241. The reversal of 121218239 is 932812121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121218239 - 2⁸ = 121217983 is a prime.

It is a super-2 number, since 2×121218239² = 29387722932522242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121218269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157247 + ... + 158015.

It is an arithmetic number, because the mean of its divisors is an integer number (15252930).

Almost surely, 2^121218239 is an apocalyptic number.

121218239 is a deficient number, since it is larger than the sum of its proper divisors (805201).

121218239 is an equidigital number, since it uses as much as digits as its factorization.

121218239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609.

The product of its digits is 1728, while the sum is 29.

The square root of 121218239 is about 11009.9154855975. The cubic root of 121218239 is about 494.9059291359.

The spelling of 121218239 in words is "one hundred twenty-one million, two hundred eighteen thousand, two hundred thirty-nine".