218388234241 has 4 divisors (see below), whose sum is σ = 218390743300. Its totient is φ = 218385725184.

The previous prime is 218388234221. The next prime is 218388234299. The reversal of 218388234241 is 142432883812.

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

It can be written as a sum of positive squares in 2 ways, for example, as 200506928400 + 17881305841 = 447780^2 + 133721^2 .

It is a cyclic number.

It is not a de Polignac number, because 218388234241 - 2²¹ = 218386137089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 218388234191 and 218388234200.

It is not an unprimeable number, because it can be changed into a prime (218388234221) 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, 1119096 + ... + 1299673.

It is an arithmetic number, because the mean of its divisors is an integer number (54597685825).

Almost surely, 2^218388234241 is an apocalyptic number.

It is an amenable number.

218388234241 is a deficient number, since it is larger than the sum of its proper divisors (2509059).

218388234241 is an equidigital number, since it uses as much as digits as its factorization.

218388234241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509058.

The product of its digits is 589824, while the sum is 46.

The spelling of 218388234241 in words is "two hundred eighteen billion, three hundred eighty-eight million, two hundred thirty-four thousand, two hundred forty-one".