218136012 has 24 divisors (see below), whose sum is σ = 509468736. Its totient is φ = 72642768.

The previous prime is 218136007. The next prime is 218136013. The reversal of 218136012 is 210631812.

It is not an unprimeable number, because it can be changed into a prime (218136013) 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, 5383 + ... + 21569.

It is an arithmetic number, because the mean of its divisors is an integer number (21227864).

Almost surely, 2^218136012 is an apocalyptic number.

It is an amenable number.

218136012 is an abundant number, since it is smaller than the sum of its proper divisors (291332724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218136012 is a wasteful number, since it uses less digits than its factorization.

218136012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17317 (or 17315 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 218136012 is about 14769.4282895446. The cubic root of 218136012 is about 601.9713050564.

Adding to 218136012 its reverse (210631812), we get a palindrome (428767824).

The spelling of 218136012 in words is "two hundred eighteen million, one hundred thirty-six thousand, twelve".