12299821 has 4 divisors (see below), whose sum is σ = 12947200. Its totient is φ = 11652444.

The previous prime is 12299813. The next prime is 12299863. The reversal of 12299821 is 12899221.

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 a cyclic number.

It is not a de Polignac number, because 12299821 - 2³ = 12299813 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 (12299321) 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, 323661 + ... + 323698.

It is an arithmetic number, because the mean of its divisors is an integer number (3236800).

Almost surely, 2^12299821 is an apocalyptic number.

It is an amenable number.

12299821 is a deficient number, since it is larger than the sum of its proper divisors (647379).

12299821 is an equidigital number, since it uses as much as digits as its factorization.

12299821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647378.

The product of its digits is 5184, while the sum is 34.

The square root of 12299821 is about 3507.1100638560. The cubic root of 12299821 is about 230.8339042011.

The spelling of 12299821 in words is "twelve million, two hundred ninety-nine thousand, eight hundred twenty-one".