12221211111111 has 12 divisors (see below), whose sum is σ = 18129964831992. Its totient is φ = 7927272071856.

The previous prime is 12221211111091. The next prime is 12221211111133. The reversal of 12221211111111 is 11111111212221.

12221211111111 is a `hidden beast` number, since 12 + 221 + 211 + 111 + 111 = 666.

It is not a de Polignac number, because 12221211111111 - 2⁵ = 12221211111079 is a prime.

12221211111111 is a modest number, since divided by 11111111 gives 122212 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221211111511) 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, 18350166501 + ... + 18350167166.

It is an arithmetic number, because the mean of its divisors is an integer number (1510830402666).

Almost surely, 2^{12221211111111} is an apocalyptic number.

12221211111111 is a deficient number, since it is larger than the sum of its proper divisors (5908753720881).

12221211111111 is a wasteful number, since it uses less digits than its factorization.

12221211111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36700333710 (or 36700333707 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 12221211111111 its reverse (11111111212221), we get a palindrome (23332322323332).

The spelling of 12221211111111 in words is "twelve trillion, two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, one hundred eleven".