221222211111 has 24 divisors (see below), whose sum is σ = 366939555840. Its totient is φ = 127017536400.

The previous prime is 221222211109. The next prime is 221222211151. The reversal of 221222211111 is 111112222122.

221222211111 is a `hidden beast` number, since 221 + 222 + 211 + 1 + 11 = 666.

It is not a de Polignac number, because 221222211111 - 2¹ = 221222211109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222211101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58802535 + ... + 58806296.

It is an arithmetic number, because the mean of its divisors is an integer number (15289148160).

Almost surely, 2^221222211111 is an apocalyptic number.

221222211111 is a deficient number, since it is larger than the sum of its proper divisors (145717344729).

221222211111 is a wasteful number, since it uses less digits than its factorization.

221222211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117608867 (or 117608864 counting only the distinct ones).

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

Adding to 221222211111 its reverse (111112222122), we get a palindrome (332334433233).

It can be divided in two parts, 2212222111 and 11, that added together give a palindrome (2212222122).

The spelling of 221222211111 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred eleven thousand, one hundred eleven".