12210111 has 18 divisors (see below), whose sum is σ = 18144672. Its totient is φ = 7912080.

The previous prime is 12210101. The next prime is 12210113. The reversal of 12210111 is 11101221.

It is a happy number.

It is not a de Polignac number, because 12210111 - 2¹⁵ = 12177343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12210093 and 12210102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11826 + ... + 12816.

Almost surely, 2^12210111 is an apocalyptic number.

12210111 is a deficient number, since it is larger than the sum of its proper divisors (5934561).

12210111 is an equidigital number, since it uses as much as digits as its factorization.

12210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071 (or 1031 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 12210111 is about 3494.2969249908. The cubic root of 12210111 is about 230.2713306993.

Adding to 12210111 its reverse (11101221), we get a palindrome (23311332).

It can be divided in two parts, 12210 and 111, that added together give a palindrome (12321).

The spelling of 12210111 in words is "twelve million, two hundred ten thousand, one hundred eleven".