12431221 has 8 divisors (see below), whose sum is σ = 13616064. Its totient is φ = 11255520.

The previous prime is 12431197. The next prime is 12431239. The reversal of 12431221 is 12213421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12431221 - 2⁵ = 12431189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12431195 and 12431204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12431281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745 + ... + 5041.

It is an arithmetic number, because the mean of its divisors is an integer number (1702008).

Almost surely, 2^12431221 is an apocalyptic number.

12431221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12431221 is a deficient number, since it is larger than the sum of its proper divisors (1184843).

12431221 is a wasteful number, since it uses less digits than its factorization.

12431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4571.

The product of its digits is 96, while the sum is 16.

The square root of 12431221 is about 3525.7936695161. The cubic root of 12431221 is about 231.6530001312.

Adding to 12431221 its reverse (12213421), we get a palindrome (24644642).

The spelling of 12431221 in words is "twelve million, four hundred thirty-one thousand, two hundred twenty-one".