121218224 has 20 divisors (see below), whose sum is σ = 238712400. Its totient is φ = 59615040.

The previous prime is 121218199. The next prime is 121218241. The reversal of 121218224 is 422812121.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 121218224.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61124 + ... + 63075.

It is an arithmetic number, because the mean of its divisors is an integer number (11935620).

Almost surely, 2^121218224 is an apocalyptic number.

It is an amenable number.

121218224 is a deficient number, since it is larger than the sum of its proper divisors (117494176).

121218224 is a wasteful number, since it uses less digits than its factorization.

121218224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124268 (or 124262 counting only the distinct ones).

The product of its digits is 512, while the sum is 23.

The square root of 121218224 is about 11009.9148043934. The cubic root of 121218224 is about 494.9059087221.

The spelling of 121218224 in words is "one hundred twenty-one million, two hundred eighteen thousand, two hundred twenty-four".