12111215 has 4 divisors (see below), whose sum is σ = 14533464. Its totient is φ = 9688968.

The previous prime is 12111199. The next prime is 12111217. The reversal of 12111215 is 51211121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12111215 - 2⁴ = 12111199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12111215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111217) 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, 1211117 + ... + 1211126.

It is an arithmetic number, because the mean of its divisors is an integer number (3633366).

Almost surely, 2^12111215 is an apocalyptic number.

12111215 is a deficient number, since it is larger than the sum of its proper divisors (2422249).

12111215 is an equidigital number, since it uses as much as digits as its factorization.

12111215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422248.

The product of its digits is 20, while the sum is 14.

The square root of 12111215 is about 3480.1170957311. The cubic root of 12111215 is about 229.6479491188.

Adding to 12111215 its reverse (51211121), we get a palindrome (63322336).

The spelling of 12111215 in words is "twelve million, one hundred eleven thousand, two hundred fifteen".