12221210211111 has 24 divisors (see below), whose sum is σ = 19385198801280. Its totient is φ = 7357742442000.

The previous prime is 12221210211107. The next prime is 12221210211149. The reversal of 12221210211111 is 11111201212221.

It is a happy number.

12221210211111 is a `hidden beast` number, since 1 + 222 + 121 + 0 + 211 + 111 = 666.

It is not a de Polignac number, because 12221210211111 - 2² = 12221210211107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221210211101) 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, 408748521 + ... + 408778418.

It is an arithmetic number, because the mean of its divisors is an integer number (807716616720).

Almost surely, 2^{12221210211111} is an apocalyptic number.

12221210211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12221210211111 is a deficient number, since it is larger than the sum of its proper divisors (7163988590169).

12221210211111 is a wasteful number, since it uses less digits than its factorization.

12221210211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817527107 (or 817527104 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12221210211111 its reverse (11111201212221), we get a palindrome (23332411423332).

The spelling of 12221210211111 in words is "twelve trillion, two hundred twenty-one billion, two hundred ten million, two hundred eleven thousand, one hundred eleven".