218222193 has 16 divisors (see below), whose sum is σ = 337982336. Its totient is φ = 122653440.

The previous prime is 218222177. The next prime is 218222197. The reversal of 218222193 is 391222812.

It is not a de Polignac number, because 218222193 - 2⁴ = 218222177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 218222193.

It is not an unprimeable number, because it can be changed into a prime (218222197) 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, 83896 + ... + 86457.

It is an arithmetic number, because the mean of its divisors is an integer number (21123896).

Almost surely, 2^218222193 is an apocalyptic number.

It is an amenable number.

218222193 is a deficient number, since it is larger than the sum of its proper divisors (119760143).

218222193 is a wasteful number, since it uses less digits than its factorization.

218222193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170424.

The product of its digits is 3456, while the sum is 30.

The square root of 218222193 is about 14772.3455483549. The cubic root of 218222193 is about 602.0505700648.

The spelling of 218222193 in words is "two hundred eighteen million, two hundred twenty-two thousand, one hundred ninety-three".