12122201218 has 4 divisors (see below), whose sum is σ = 18183301830. Its totient is φ = 6061100608.

The previous prime is 12122201213. The next prime is 12122201239. The reversal of 12122201218 is 81210222121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8611283209 + 3510918009 = 92797^2 + 59253^2 .

It is not an unprimeable number, because it can be changed into a prime (12122201213) 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 as a sum of consecutive naturals, namely, 3030550303 + ... + 3030550306.

Almost surely, 2^12122201218 is an apocalyptic number.

12122201218 is a deficient number, since it is larger than the sum of its proper divisors (6061100612).

12122201218 is an equidigital number, since it uses as much as digits as its factorization.

12122201218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6061100611.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 12122201218 its reverse (81210222121), we get a palindrome (93332423339).

The spelling of 12122201218 in words is "twelve billion, one hundred twenty-two million, two hundred one thousand, two hundred eighteen".