218221842 has 8 divisors (see below), whose sum is σ = 436443696. Its totient is φ = 72740612.

The previous prime is 218221841. The next prime is 218221847. The reversal of 218221842 is 248122812.

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

218221842 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (218221841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18185148 + ... + 18185159.

It is an arithmetic number, because the mean of its divisors is an integer number (54555462).

Almost surely, 2^218221842 is an apocalyptic number.

218221842 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.

218221842 is a wasteful number, since it uses less digits than its factorization.

218221842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36370312.

The product of its digits is 4096, while the sum is 30.

The square root of 218221842 is about 14772.3336680431. Note that the first 3 decimals coincide. The cubic root of 218221842 is about 602.0502472748.

The spelling of 218221842 in words is "two hundred eighteen million, two hundred twenty-one thousand, eight hundred forty-two".