12921823 has 4 divisors (see below), whose sum is σ = 13338688. Its totient is φ = 12504960.

The previous prime is 12921817. The next prime is 12921829. The reversal of 12921823 is 32812921.

12921823 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.

It is an interprime number because it is at equal distance from previous prime (12921817) and next prime (12921829).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12921823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12921791 and 12921800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921829) 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, 208386 + ... + 208447.

It is an arithmetic number, because the mean of its divisors is an integer number (3334672).

Almost surely, 2^12921823 is an apocalyptic number.

12921823 is a deficient number, since it is larger than the sum of its proper divisors (416865).

12921823 is an equidigital number, since it uses as much as digits as its factorization.

12921823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416864.

The product of its digits is 1728, while the sum is 28.

The square root of 12921823 is about 3594.6937282611. The cubic root of 12921823 is about 234.6611867138.

It can be divided in two parts, 129 and 21823, that added together give a cube (21952 = 28³).

The spelling of 12921823 in words is "twelve million, nine hundred twenty-one thousand, eight hundred twenty-three".