216221115211 has 4 divisors (see below), whose sum is σ = 216823402800. Its totient is φ = 215618827624.

The previous prime is 216221115203. The next prime is 216221115251. The reversal of 216221115211 is 112511122612.

216221115211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 216221115211 - 2³ = 216221115203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216221115251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301143256 + ... + 301143973.

It is an arithmetic number, because the mean of its divisors is an integer number (54205850700).

Almost surely, 2^216221115211 is an apocalyptic number.

216221115211 is a deficient number, since it is larger than the sum of its proper divisors (602287589).

216221115211 is an equidigital number, since it uses as much as digits as its factorization.

216221115211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602287588.

The product of its digits is 480, while the sum is 25.

Adding to 216221115211 its reverse (112511122612), we get a palindrome (328732237823).

The spelling of 216221115211 in words is "two hundred sixteen billion, two hundred twenty-one million, one hundred fifteen thousand, two hundred eleven".