221211222111 has 48 divisors (see below), whose sum is σ = 352482268320. Its totient is φ = 132567183360.

The previous prime is 221211222013. The next prime is 221211222137. The reversal of 221211222111 is 111222112122.

221211222111 is a `hidden beast` number, since 221 + 211 + 2 + 221 + 11 = 666.

221211222111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221211222111 - 2¹¹ = 221211220063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211222151) 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 47 ways as a sum of consecutive naturals, for example, 11446725 + ... + 11466033.

It is an arithmetic number, because the mean of its divisors is an integer number (7343380590).

Almost surely, 2^221211222111 is an apocalyptic number.

221211222111 is a deficient number, since it is larger than the sum of its proper divisors (131271046209).

221211222111 is a wasteful number, since it uses less digits than its factorization.

221211222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20616 (or 20613 counting only the distinct ones).

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

Adding to 221211222111 its reverse (111222112122), we get a palindrome (332433334233).

The spelling of 221211222111 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, one hundred eleven".