218221241 has 8 divisors (see below), whose sum is σ = 251300544. Its totient is φ = 185618160.

The previous prime is 218221189. The next prime is 218221249. The reversal of 218221241 is 142122812.

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

It is a de Polignac number, because none of the positive numbers 2^k-218221241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218221249) 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, 118070 + ... + 119903.

It is an arithmetic number, because the mean of its divisors is an integer number (31412568).

Almost surely, 2^218221241 is an apocalyptic number.

It is an amenable number.

218221241 is a deficient number, since it is larger than the sum of its proper divisors (33079303).

218221241 is a wasteful number, since it uses less digits than its factorization.

218221241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238111.

The product of its digits is 512, while the sum is 23.

The square root of 218221241 is about 14772.3133259486. The cubic root of 218221241 is about 602.0496945765.

The spelling of 218221241 in words is "two hundred eighteen million, two hundred twenty-one thousand, two hundred forty-one".