12221100218 has 8 divisors (see below), whose sum is σ = 18332319060. Its totient is φ = 6110327200.

The previous prime is 12221100217. The next prime is 12221100263. The reversal of 12221100218 is 81200112221.

It can be written as a sum of positive squares in 2 ways, for example, as 10854097489 + 1367002729 = 104183^2 + 36973^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 12221100218.

It is not an unprimeable number, because it can be changed into a prime (12221100217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31433 + ... + 159468.

Almost surely, 2^12221100218 is an apocalyptic number.

12221100218 is a deficient number, since it is larger than the sum of its proper divisors (6111218842).

12221100218 is a wasteful number, since it uses less digits than its factorization.

12221100218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222912.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12221100218 its reverse (81200112221), we get a palindrome (93421212439).

The spelling of 12221100218 in words is "twelve billion, two hundred twenty-one million, one hundred thousand, two hundred eighteen".