12821573 has 4 divisors (see below), whose sum is σ = 13168140. Its totient is φ = 12475008.

The previous prime is 12821551. The next prime is 12821579. The reversal of 12821573 is 37512821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9443329 + 3378244 = 3073^2 + 1838^2 .

It is a cyclic number.

It is not a de Polignac number, because 12821573 - 2⁸ = 12821317 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 (12821579) 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, 173228 + ... + 173301.

It is an arithmetic number, because the mean of its divisors is an integer number (3292035).

Almost surely, 2^12821573 is an apocalyptic number.

It is an amenable number.

12821573 is a deficient number, since it is larger than the sum of its proper divisors (346567).

12821573 is an equidigital number, since it uses as much as digits as its factorization.

12821573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346566.

The product of its digits is 3360, while the sum is 29.

The square root of 12821573 is about 3580.7224131451. The cubic root of 12821573 is about 234.0527616190.

The spelling of 12821573 in words is "twelve million, eight hundred twenty-one thousand, five hundred seventy-three".