12215105 has 16 divisors (see below), whose sum is σ = 17005440. Its totient is φ = 8249472.

The previous prime is 12215101. The next prime is 12215123. The reversal of 12215105 is 50151221.

It is not a de Polignac number, because 12215105 - 2² = 12215101 is a prime.

It is a super-2 number, since 2×12215105² = 298417580322050, which contains 22 as substring.

It is a plaindrome in base 15.

It is a zygodrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (12215101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260 + ... + 4949.

It is an arithmetic number, because the mean of its divisors is an integer number (1062840).

Almost surely, 2^12215105 is an apocalyptic number.

It is an amenable number.

12215105 is a deficient number, since it is larger than the sum of its proper divisors (4790335).

12215105 is an equidigital number, since it uses as much as digits as its factorization.

12215105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5288.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 12215105 is about 3495.0114449026. The cubic root of 12215105 is about 230.3027204844.

Adding to 12215105 its reverse (50151221), we get a palindrome (62366326).

The spelling of 12215105 in words is "twelve million, two hundred fifteen thousand, one hundred five".