12544721 has 4 divisors (see below), whose sum is σ = 14336832. Its totient is φ = 10752612.

The previous prime is 12544709. The next prime is 12544747. The reversal of 12544721 is 12744521.

12544721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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: 12744521 = 197 ⋅64693.

It is a cyclic number.

It is not a de Polignac number, because 12544721 - 2¹⁸ = 12282577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12544751) 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, 896045 + ... + 896058.

It is an arithmetic number, because the mean of its divisors is an integer number (3584208).

Almost surely, 2^12544721 is an apocalyptic number.

It is an amenable number.

12544721 is a deficient number, since it is larger than the sum of its proper divisors (1792111).

12544721 is an equidigital number, since it uses as much as digits as its factorization.

12544721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792110.

The product of its digits is 2240, while the sum is 26.

The square root of 12544721 is about 3541.8527637382. The cubic root of 12544721 is about 232.3558809309.

The spelling of 12544721 in words is "twelve million, five hundred forty-four thousand, seven hundred twenty-one".