218215226 has 8 divisors (see below), whose sum is σ = 329283360. Its totient is φ = 108454108.

The previous prime is 218215223. The next prime is 218215259. The reversal of 218215226 is 622512812.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (218215223) 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 3 ways as a sum of consecutive naturals, for example, 326336 + ... + 327003.

It is an arithmetic number, because the mean of its divisors is an integer number (41160420).

Almost surely, 2^218215226 is an apocalyptic number.

218215226 is a deficient number, since it is larger than the sum of its proper divisors (111068134).

218215226 is a wasteful number, since it uses less digits than its factorization.

218215226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653508.

The product of its digits is 3840, while the sum is 29.

The square root of 218215226 is about 14772.1097342255. The cubic root of 218215226 is about 602.0441629393.

The spelling of 218215226 in words is "two hundred eighteen million, two hundred fifteen thousand, two hundred twenty-six".