221222111211 has 12 divisors (see below), whose sum is σ = 323133422040. Its totient is φ = 145824312480.

The previous prime is 221222111197. The next prime is 221222111221. The reversal of 221222111211 is 112111222122.

221222111211 is a `hidden beast` number, since 221 + 2 + 221 + 11 + 211 = 666.

It is not a de Polignac number, because 221222111211 - 2⁵ = 221222111179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221222111221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138090405 + ... + 138092006.

It is an arithmetic number, because the mean of its divisors is an integer number (26927785170).

Almost surely, 2^221222111211 is an apocalyptic number.

221222111211 is a deficient number, since it is larger than the sum of its proper divisors (101911310829).

221222111211 is a wasteful number, since it uses less digits than its factorization.

221222111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276182506 (or 276182503 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 221222111211 its reverse (112111222122), we get a palindrome (333333333333).

The spelling of 221222111211 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, two hundred eleven".