12299921 has 4 divisors (see below), whose sum is σ = 12308592. Its totient is φ = 12291252.

The previous prime is 12299899. The next prime is 12299923. The reversal of 12299921 is 12999221.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12999221 = 29 ⋅448249.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12299921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12299923) 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, 1655 + ... + 5228.

It is an arithmetic number, because the mean of its divisors is an integer number (3077148).

Almost surely, 2^12299921 is an apocalyptic number.

It is an amenable number.

12299921 is a deficient number, since it is larger than the sum of its proper divisors (8671).

12299921 is an equidigital number, since it uses as much as digits as its factorization.

12299921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8670.

The product of its digits is 5832, while the sum is 35.

The square root of 12299921 is about 3507.1243205795. The cubic root of 12299921 is about 230.8345297747.

It can be divided in two parts, 1 and 2299921, that added together give a palindrome (2299922).

The spelling of 12299921 in words is "twelve million, two hundred ninety-nine thousand, nine hundred twenty-one".