12721317 has 16 divisors (see below), whose sum is σ = 20405760. Its totient is φ = 6886512.

The previous prime is 12721273. The next prime is 12721333. The reversal of 12721317 is 71312721.

It is not a de Polignac number, because 12721317 - 2¹⁸ = 12459173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15543 + ... + 16340.

It is an arithmetic number, because the mean of its divisors is an integer number (1275360).

Almost surely, 2^12721317 is an apocalyptic number.

It is an amenable number.

12721317 is a deficient number, since it is larger than the sum of its proper divisors (7684443).

12721317 is a wasteful number, since it uses less digits than its factorization.

12721317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31912.

The product of its digits is 588, while the sum is 24.

The square root of 12721317 is about 3566.6955294782. The cubic root of 12721317 is about 233.4411200423.

The spelling of 12721317 in words is "twelve million, seven hundred twenty-one thousand, three hundred seventeen".