12221000218 has 24 divisors (see below), whose sum is σ = 21111847776. Its totient is φ = 5197487880.

The previous prime is 12221000179. The next prime is 12221000219. The reversal of 12221000218 is 81200012221.

12221000218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 12221000195 and 12221000204.

It is not an unprimeable number, because it can be changed into a prime (12221000219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214821 + ... + 265687.

It is an arithmetic number, because the mean of its divisors is an integer number (879660324).

Almost surely, 2^12221000218 is an apocalyptic number.

12221000218 is a deficient number, since it is larger than the sum of its proper divisors (8890847558).

12221000218 is an equidigital number, since it uses as much as digits as its factorization.

12221000218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51138 (or 51007 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12221000218 its reverse (81200012221), we get a palindrome (93421012439).

The spelling of 12221000218 in words is "twelve billion, two hundred twenty-one million, two hundred eighteen", and thus it is an aban number.