12718221 has 8 divisors (see below), whose sum is σ = 16987584. Its totient is φ = 8463840.

The previous prime is 12718213. The next prime is 12718249. The reversal of 12718221 is 12281721.

12718221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12718221 - 2³ = 12718213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12718191 and 12718200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12718291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1585 + ... + 5286.

It is an arithmetic number, because the mean of its divisors is an integer number (2123448).

Almost surely, 2^12718221 is an apocalyptic number.

It is an amenable number.

12718221 is a deficient number, since it is larger than the sum of its proper divisors (4269363).

12718221 is an equidigital number, since it uses as much as digits as its factorization.

12718221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7491.

The product of its digits is 448, while the sum is 24.

The square root of 12718221 is about 3566.2614878890. The cubic root of 12718221 is about 233.4221809040.

Adding to 12718221 its reverse (12281721), we get a palindrome (24999942).

The spelling of 12718221 in words is "twelve million, seven hundred eighteen thousand, two hundred twenty-one".