218221044 has 48 divisors (see below), whose sum is σ = 551694528. Its totient is φ = 66866688.

The previous prime is 218221007. The next prime is 218221049. The reversal of 218221044 is 440122812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218221049) 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 15 ways as a sum of consecutive naturals, for example, 3667 + ... + 21210.

It is an arithmetic number, because the mean of its divisors is an integer number (11493636).

Almost surely, 2^218221044 is an apocalyptic number.

It is an amenable number.

218221044 is an abundant number, since it is smaller than the sum of its proper divisors (333473484).

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

218221044 is a wasteful number, since it uses less digits than its factorization.

218221044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24944 (or 24942 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 218221044 is about 14772.3066580680. The cubic root of 218221044 is about 602.0495134089.

Adding to 218221044 its reverse (440122812), we get a palindrome (658343856).

The spelling of 218221044 in words is "two hundred eighteen million, two hundred twenty-one thousand, forty-four".