218023011 has 24 divisors (see below), whose sum is σ = 335690784. Its totient is φ = 135878400.

The previous prime is 218022997. The next prime is 218023019. The reversal of 218023011 is 110320812.

It is not a de Polignac number, because 218023011 - 2⁵ = 218022979 is a prime.

It is a super-2 number, since 2×218023011² = 95068066651012242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218023019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18385 + ... + 27821.

It is an arithmetic number, because the mean of its divisors is an integer number (13987116).

Almost surely, 2^218023011 is an apocalyptic number.

218023011 is a deficient number, since it is larger than the sum of its proper divisors (117667773).

218023011 is a wasteful number, since it uses less digits than its factorization.

218023011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9611 (or 9608 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 218023011 is about 14765.6022904587. The cubic root of 218023011 is about 601.8673407021.

Adding to 218023011 its reverse (110320812), we get a palindrome (328343823).

The spelling of 218023011 in words is "two hundred eighteen million, twenty-three thousand, eleven".