12673821 has 4 divisors (see below), whose sum is σ = 16898432. Its totient is φ = 8449212.

The previous prime is 12673811. The next prime is 12673831. The reversal of 12673821 is 12837621.

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 an interprime number because it is at equal distance from previous prime (12673811) and next prime (12673831).

It is a de Polignac number, because none of the positive numbers 2^k-12673821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12673811) 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, 2112301 + ... + 2112306.

It is an arithmetic number, because the mean of its divisors is an integer number (4224608).

Almost surely, 2^12673821 is an apocalyptic number.

It is an amenable number.

12673821 is a deficient number, since it is larger than the sum of its proper divisors (4224611).

12673821 is an equidigital number, since it uses as much as digits as its factorization.

12673821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224610.

The product of its digits is 4032, while the sum is 30.

The square root of 12673821 is about 3560.0310391905. The cubic root of 12673821 is about 233.1502343625.

The spelling of 12673821 in words is "twelve million, six hundred seventy-three thousand, eight hundred twenty-one".