218221134 has 8 divisors (see below), whose sum is σ = 436442280. Its totient is φ = 72740376.

The previous prime is 218221111. The next prime is 218221187. The reversal of 218221134 is 431122812.

It is a sphenic number, since it is the product of 3 distinct primes.

218221134 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18185089 + ... + 18185100.

It is an arithmetic number, because the mean of its divisors is an integer number (54555285).

Almost surely, 2^218221134 is an apocalyptic number.

218221134 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218221134 is a wasteful number, since it uses less digits than its factorization.

218221134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36370194.

The product of its digits is 768, while the sum is 24.

The square root of 218221134 is about 14772.3097043083. The cubic root of 218221134 is about 602.0495961758.

Adding to 218221134 its reverse (431122812), we get a palindrome (649343946).

The spelling of 218221134 in words is "two hundred eighteen million, two hundred twenty-one thousand, one hundred thirty-four".