121398218 has 8 divisors (see below), whose sum is σ = 182145348. Its totient is φ = 60683104.

The previous prime is 121398187. The next prime is 121398247. The reversal of 121398218 is 812893121.

It can be written as a sum of positive squares in 2 ways, for example, as 108097609 + 13300609 = 10397^2 + 3647^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7430 + ... + 17262.

Almost surely, 2^121398218 is an apocalyptic number.

121398218 is a deficient number, since it is larger than the sum of its proper divisors (60747130).

121398218 is an equidigital number, since it uses as much as digits as its factorization.

121398218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16008.

The product of its digits is 6912, while the sum is 35.

The square root of 121398218 is about 11018.0859499280. The cubic root of 121398218 is about 495.1507455037.

The spelling of 121398218 in words is "one hundred twenty-one million, three hundred ninety-eight thousand, two hundred eighteen".