121819218 has 8 divisors (see below), whose sum is σ = 243638448. Its totient is φ = 40606404.

The previous prime is 121819193. The next prime is 121819223. The reversal of 121819218 is 812918121.

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

121819218 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10151596 + ... + 10151607.

It is an arithmetic number, because the mean of its divisors is an integer number (30454806).

Almost surely, 2^121819218 is an apocalyptic number.

121819218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121819218 is a wasteful number, since it uses less digits than its factorization.

121819218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20303208.

The product of its digits is 2304, while the sum is 33.

The square root of 121819218 is about 11037.1743666574. The cubic root of 121819218 is about 495.7224671145.

The spelling of 121819218 in words is "one hundred twenty-one million, eight hundred nineteen thousand, two hundred eighteen".