12687621 has 4 divisors (see below), whose sum is σ = 16916832. Its totient is φ = 8458412.

The previous prime is 12687613. The next prime is 12687659. The reversal of 12687621 is 12678621.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12678621 = 3 ⋅4226207.

It is a cyclic number.

It is not a de Polignac number, because 12687621 - 2³ = 12687613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12687601) 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, 2114601 + ... + 2114606.

It is an arithmetic number, because the mean of its divisors is an integer number (4229208).

Almost surely, 2^12687621 is an apocalyptic number.

It is an amenable number.

12687621 is a deficient number, since it is larger than the sum of its proper divisors (4229211).

12687621 is an equidigital number, since it uses as much as digits as its factorization.

12687621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4229210.

The product of its digits is 8064, while the sum is 33.

The square root of 12687621 is about 3561.9686972235. The cubic root of 12687621 is about 233.2348262192.

The spelling of 12687621 in words is "twelve million, six hundred eighty-seven thousand, six hundred twenty-one".