12673521 has 12 divisors (see below), whose sum is σ = 20921472. Its totient is φ = 7241976.

The previous prime is 12673501. The next prime is 12673523. The reversal of 12673521 is 12537621.

It is a happy number.

It is not a de Polignac number, because 12673521 - 2⁵ = 12673489 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12673523) 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 11 ways as a sum of consecutive naturals, for example, 100521 + ... + 100646.

It is an arithmetic number, because the mean of its divisors is an integer number (1743456).

Almost surely, 2^12673521 is an apocalyptic number.

It is an amenable number.

12673521 is a deficient number, since it is larger than the sum of its proper divisors (8247951).

12673521 is a wasteful number, since it uses less digits than its factorization.

12673521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201180 (or 201177 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 12673521 is about 3559.9889044771. The cubic root of 12673521 is about 233.1483947273.

It can be divided in two parts, 126735 and 21, that added together give a triangular number (126756 = T₅₀₃).

The spelling of 12673521 in words is "twelve million, six hundred seventy-three thousand, five hundred twenty-one".