12103515 has 24 divisors (see below), whose sum is σ = 21076848. Its totient is φ = 6425280.

The previous prime is 12103501. The next prime is 12103517. The reversal of 12103515 is 51530121.

It is not a de Polignac number, because 12103515 - 2⁷ = 12103387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12103517) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11980 + ... + 12950.

It is an arithmetic number, because the mean of its divisors is an integer number (878202).

Almost surely, 2^12103515 is an apocalyptic number.

12103515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12103515 is a deficient number, since it is larger than the sum of its proper divisors (8973333).

12103515 is a wasteful number, since it uses less digits than its factorization.

12103515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259 (or 1256 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 12103515 is about 3479.0106352238. The cubic root of 12103515 is about 229.5992707083.

Adding to 12103515 its reverse (51530121), we get a palindrome (63633636).

The spelling of 12103515 in words is "twelve million, one hundred three thousand, five hundred fifteen".