12716421 has 4 divisors (see below), whose sum is σ = 16955232. Its totient is φ = 8477612.

The previous prime is 12716411. The next prime is 12716423. The reversal of 12716421 is 12461721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12716421 - 2⁹ = 12715909 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12716391 and 12716400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12716423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2119401 + ... + 2119406.

It is an arithmetic number, because the mean of its divisors is an integer number (4238808).

Almost surely, 2^12716421 is an apocalyptic number.

It is an amenable number.

12716421 is a deficient number, since it is larger than the sum of its proper divisors (4238811).

12716421 is an equidigital number, since it uses as much as digits as its factorization.

12716421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4238810.

The product of its digits is 672, while the sum is 24.

The square root of 12716421 is about 3566.0091138414. The cubic root of 12716421 is about 233.4111683641.

The spelling of 12716421 in words is "twelve million, seven hundred sixteen thousand, four hundred twenty-one".