218038321 has 8 divisors (see below), whose sum is σ = 228127680. Its totient is φ = 207999792.

The previous prime is 218038313. The next prime is 218038333. The reversal of 218038321 is 123830812.

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

It is a cyclic number.

It is not a de Polignac number, because 218038321 - 2³ = 218038313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218038321.

It is not an unprimeable number, because it can be changed into a prime (218038351) 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 7 ways as a sum of consecutive naturals, for example, 3790 + ... + 21223.

It is an arithmetic number, because the mean of its divisors is an integer number (28515960).

Almost surely, 2^218038321 is an apocalyptic number.

It is an amenable number.

218038321 is a deficient number, since it is larger than the sum of its proper divisors (10089359).

218038321 is a wasteful number, since it uses less digits than its factorization.

218038321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25415.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 218038321 is about 14766.1207160175. The cubic root of 218038321 is about 601.8814284709.

The spelling of 218038321 in words is "two hundred eighteen million, thirty-eight thousand, three hundred twenty-one".