218210047 has 4 divisors (see below), whose sum is σ = 238047336. Its totient is φ = 198372760.

The previous prime is 218210021. The next prime is 218210059. The reversal of 218210047 is 740012812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 218210047 - 2¹⁵ = 218177279 is a prime.

It is a super-3 number, since 3×218210047³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218210017) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 9918628 + ... + 9918649.

It is an arithmetic number, because the mean of its divisors is an integer number (59511834).

Almost surely, 2^218210047 is an apocalyptic number.

218210047 is a deficient number, since it is larger than the sum of its proper divisors (19837289).

218210047 is a wasteful number, since it uses less digits than its factorization.

218210047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19837288.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 218210047 is about 14771.9344366268. The cubic root of 218210047 is about 602.0394000401.

Adding to 218210047 its reverse (740012812), we get a palindrome (958222859).

The spelling of 218210047 in words is "two hundred eighteen million, two hundred ten thousand, forty-seven".