218240122 has 4 divisors (see below), whose sum is σ = 327360186. Its totient is φ = 109120060.

The previous prime is 218240111. The next prime is 218240153. The reversal of 218240122 is 221042812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 217238121 + 1002001 = 14739^2 + 1001^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 218240093 and 218240102.

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 as a sum of consecutive naturals, namely, 54560029 + ... + 54560032.

Almost surely, 2^218240122 is an apocalyptic number.

218240122 is a deficient number, since it is larger than the sum of its proper divisors (109120064).

218240122 is a wasteful number, since it uses less digits than its factorization.

218240122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109120063.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 218240122 is about 14772.9523792639. The cubic root of 218240122 is about 602.0670576471.

Adding to 218240122 its reverse (221042812), we get a palindrome (439282934).

The spelling of 218240122 in words is "two hundred eighteen million, two hundred forty thousand, one hundred twenty-two".