12213111 has 4 divisors (see below), whose sum is σ = 16284152. Its totient is φ = 8142072.

The previous prime is 12213109. The next prime is 12213127. The reversal of 12213111 is 11131221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11131221 = 3 ⋅3710407.

It is not a de Polignac number, because 12213111 - 2¹ = 12213109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2035516 + ... + 2035521.

It is an arithmetic number, because the mean of its divisors is an integer number (4071038).

Almost surely, 2^12213111 is an apocalyptic number.

12213111 is a deficient number, since it is larger than the sum of its proper divisors (4071041).

12213111 is an equidigital number, since it uses as much as digits as its factorization.

12213111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071040.

The product of its digits is 12, while the sum is 12.

The square root of 12213111 is about 3494.7261695303. The cubic root of 12213111 is about 230.2901882244.

Adding to 12213111 its reverse (11131221), we get a palindrome (23344332).

The spelling of 12213111 in words is "twelve million, two hundred thirteen thousand, one hundred eleven".