218220242 has 16 divisors (see below), whose sum is σ = 329677560. Its totient is φ = 108331008.

The previous prime is 218220203. The next prime is 218220259. The reversal of 218220242 is 242022812.

It can be written as a sum of positive squares in 4 ways, for example, as 211149961 + 7070281 = 14531^2 + 2659^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234434 + ... + 235362.

Almost surely, 2^218220242 is an apocalyptic number.

218220242 is a deficient number, since it is larger than the sum of its proper divisors (111457318).

218220242 is a wasteful number, since it uses less digits than its factorization.

218220242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 218220242 is about 14772.2795126548. The cubic root of 218220242 is about 602.0487758627.

The spelling of 218220242 in words is "two hundred eighteen million, two hundred twenty thousand, two hundred forty-two".