218020911 has 8 divisors (see below), whose sum is σ = 290801280. Its totient is φ = 145293912.

The previous prime is 218020889. The next prime is 218020931. The reversal of 218020911 is 119020812.

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

It is not a de Polignac number, because 218020911 - 2⁷ = 218020783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218020931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2565 + ... + 21038.

It is an arithmetic number, because the mean of its divisors is an integer number (36350160).

Almost surely, 2^218020911 is an apocalyptic number.

218020911 is a deficient number, since it is larger than the sum of its proper divisors (72780369).

218020911 is a wasteful number, since it uses less digits than its factorization.

218020911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26685.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 218020911 is about 14765.5311790670. The cubic root of 218020911 is about 601.8654082984.

Subtracting from 218020911 its reverse (119020812), we obtain a palindrome (99000099).

The spelling of 218020911 in words is "two hundred eighteen million, twenty thousand, nine hundred eleven".