12756621 has 4 divisors (see below), whose sum is σ = 17008832. Its totient is φ = 8504412.

The previous prime is 12756589. The next prime is 12756659. The reversal of 12756621 is 12665721.

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 not a de Polignac number, because 12756621 - 2⁵ = 12756589 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 (12756661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2126101 + ... + 2126106.

It is an arithmetic number, because the mean of its divisors is an integer number (4252208).

Almost surely, 2^12756621 is an apocalyptic number.

It is an amenable number.

12756621 is a deficient number, since it is larger than the sum of its proper divisors (4252211).

12756621 is an equidigital number, since it uses as much as digits as its factorization.

12756621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4252210.

The product of its digits is 5040, while the sum is 30.

The square root of 12756621 is about 3571.6412193836. The cubic root of 12756621 is about 233.6568679670.

The spelling of 12756621 in words is "twelve million, seven hundred fifty-six thousand, six hundred twenty-one".