218012842 has 4 divisors (see below), whose sum is σ = 327019266. Its totient is φ = 109006420.

The previous prime is 218012831. The next prime is 218012857. The reversal of 218012842 is 248210812.

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., 124523281 + 93489561 = 11159^2 + 9669^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 218012842.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54503209 + ... + 54503212.

Almost surely, 2^218012842 is an apocalyptic number.

218012842 is a deficient number, since it is larger than the sum of its proper divisors (109006424).

218012842 is a wasteful number, since it uses less digits than its factorization.

218012842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109006423.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 218012842 is about 14765.2579388238. The cubic root of 218012842 is about 601.8579831514.

The spelling of 218012842 in words is "two hundred eighteen million, twelve thousand, eight hundred forty-two".