12211222111 has 24 divisors (see below), whose sum is σ = 14235126192. Its totient is φ = 10430956800.

The previous prime is 12211222069. The next prime is 12211222117. The reversal of 12211222111 is 11122211221.

It is not a de Polignac number, because 12211222111 - 2¹⁹ = 12210697823 is a prime.

It is a super-2 number, since 2×12211222111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211222117) 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, 1338676 + ... + 1347766.

It is an arithmetic number, because the mean of its divisors is an integer number (593130258).

Almost surely, 2^12211222111 is an apocalyptic number.

12211222111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12211222111 is a deficient number, since it is larger than the sum of its proper divisors (2023904081).

12211222111 is a wasteful number, since it uses less digits than its factorization.

12211222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9783 (or 9772 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

Adding to 12211222111 its reverse (11122211221), we get a palindrome (23333433332).

The spelling of 12211222111 in words is "twelve billion, two hundred eleven million, two hundred twenty-two thousand, one hundred eleven".