221211022111211 has 16 divisors (see below), whose sum is σ = 241372637779968. Its totient is φ = 201057997826400.

The previous prime is 221211022111199. The next prime is 221211022111223. The reversal of 221211022111211 is 112111220112122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221211022111199) and next prime (221211022111223).

It is not a de Polignac number, because 221211022111211 - 2⁶ = 221211022111147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211022111291) 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 15 ways as a sum of consecutive naturals, for example, 1157913680 + ... + 1158104706.

It is an arithmetic number, because the mean of its divisors is an integer number (15085789861248).

Almost surely, 2^{221211022111211} is an apocalyptic number.

221211022111211 is a deficient number, since it is larger than the sum of its proper divisors (20161615668757).

221211022111211 is a wasteful number, since it uses less digits than its factorization.

221211022111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212962.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 221211022111211 its reverse (112111220112122), we get a palindrome (333322242223333).

The spelling of 221211022111211 in words is "two hundred twenty-one trillion, two hundred eleven billion, twenty-two million, one hundred eleven thousand, two hundred eleven".