121644218 has 16 divisors (see below), whose sum is σ = 185529960. Its totient is φ = 59809536.

The previous prime is 121644209. The next prime is 121644223. The reversal of 121644218 is 812446121.

It can be written as a sum of positive squares in 4 ways, for example, as 96373489 + 25270729 = 9817^2 + 5027^2 .

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 7 ways as a sum of consecutive naturals, for example, 27830 + ... + 31902.

Almost surely, 2^121644218 is an apocalyptic number.

121644218 is a deficient number, since it is larger than the sum of its proper divisors (63885742).

121644218 is a wasteful number, since it uses less digits than its factorization.

121644218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4321.

The product of its digits is 3072, while the sum is 29.

The square root of 121644218 is about 11029.2437637401. The cubic root of 121644218 is about 495.4849758346.

The spelling of 121644218 in words is "one hundred twenty-one million, six hundred forty-four thousand, two hundred eighteen".