221211112220211 has 32 divisors (see below), whose sum is σ = 308830496712192. Its totient is φ = 140577031316480.

The previous prime is 221211112220171. The next prime is 221211112220237. The reversal of 221211112220211 is 112022211112122.

It is a cyclic number.

It is not a de Polignac number, because 221211112220211 - 2¹⁹ = 221211111695923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221211112220311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 915325156 + ... + 915566798.

It is an arithmetic number, because the mean of its divisors is an integer number (9650953022256).

Almost surely, 2^{221211112220211} is an apocalyptic number.

221211112220211 is a deficient number, since it is larger than the sum of its proper divisors (87619384491981).

221211112220211 is a wasteful number, since it uses less digits than its factorization.

221211112220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287243.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221211112220211 its reverse (112022211112122), we get a palindrome (333233323332333).

The spelling of 221211112220211 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred twelve million, two hundred twenty thousand, two hundred eleven".