121257218 has 8 divisors (see below), whose sum is σ = 181953660. Its totient is φ = 60606000.

The previous prime is 121257217. The next prime is 121257239. The reversal of 121257218 is 812752121.

It can be written as a sum of positive squares in 2 ways, for example, as 118309129 + 2948089 = 10877^2 + 1717^2 .

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

It is not an unprimeable number, because it can be changed into a prime (121257217) by changing a digit.

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, 3533 + ... + 15968.

Almost surely, 2^121257218 is an apocalyptic number.

121257218 is a deficient number, since it is larger than the sum of its proper divisors (60696442).

121257218 is a wasteful number, since it uses less digits than its factorization.

121257218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22612.

The product of its digits is 2240, while the sum is 29.

The square root of 121257218 is about 11011.6855203915. The cubic root of 121257218 is about 494.9589708536.

The spelling of 121257218 in words is "one hundred twenty-one million, two hundred fifty-seven thousand, two hundred eighteen".