12317221 has 16 divisors (see below), whose sum is σ = 14553088. Its totient is φ = 10206000.

The previous prime is 12317209. The next prime is 12317233. The reversal of 12317221 is 12271321.

It is an interprime number because it is at equal distance from previous prime (12317209) and next prime (12317233).

It is not a de Polignac number, because 12317221 - 2⁷ = 12317093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12317251) 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, 45316 + ... + 45586.

It is an arithmetic number, because the mean of its divisors is an integer number (909568).

Almost surely, 2^12317221 is an apocalyptic number.

It is an amenable number.

12317221 is a deficient number, since it is larger than the sum of its proper divisors (2235867).

12317221 is a wasteful number, since it uses less digits than its factorization.

12317221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472.

The product of its digits is 168, while the sum is 19.

The square root of 12317221 is about 3509.5898620779. The cubic root of 12317221 is about 230.9427030047.

Adding to 12317221 its reverse (12271321), we get a palindrome (24588542).

The spelling of 12317221 in words is "twelve million, three hundred seventeen thousand, two hundred twenty-one".