12216105 has 96 divisors (see below), whose sum is σ = 25608960. Its totient is φ = 5322240.

The previous prime is 12216103. The next prime is 12216119. The reversal of 12216105 is 50161221.

It is not a de Polignac number, because 12216105 - 2¹ = 12216103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 330147 + ... + 330183.

It is an arithmetic number, because the mean of its divisors is an integer number (266760).

Almost surely, 2^12216105 is an apocalyptic number.

12216105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12216105 is an abundant number, since it is smaller than the sum of its proper divisors (13392855).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12216105 is a wasteful number, since it uses less digits than its factorization.

12216105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 12216105 is about 3495.1545030227. The cubic root of 12216105 is about 230.3090049558.

Adding to 12216105 its reverse (50161221), we get a palindrome (62377326).

Subtracting 12216105 from its reverse (50161221), we obtain a triangular number (37945116 = T₈₇₁₁).

It can be divided in two parts, 12216 and 105, that added together give a palindrome (12321).

The spelling of 12216105 in words is "twelve million, two hundred sixteen thousand, one hundred five".