12921265 has 16 divisors (see below), whose sum is σ = 18293760. Its totient is φ = 8573760.

The previous prime is 12921263. The next prime is 12921277. The reversal of 12921265 is 56212921.

It is not a de Polignac number, because 12921265 - 2¹ = 12921263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12921263) 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, 4870 + ... + 7039.

It is an arithmetic number, because the mean of its divisors is an integer number (1143360).

Almost surely, 2^12921265 is an apocalyptic number.

It is an amenable number.

12921265 is a deficient number, since it is larger than the sum of its proper divisors (5372495).

12921265 is a wasteful number, since it uses less digits than its factorization.

12921265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11952.

The product of its digits is 2160, while the sum is 28.

The square root of 12921265 is about 3594.6161130224. The cubic root of 12921265 is about 234.6578088925.

The spelling of 12921265 in words is "twelve million, nine hundred twenty-one thousand, two hundred sixty-five".