16344421 has 4 divisors (see below), whose sum is σ = 17055072. Its totient is φ = 15633772.

The previous prime is 16344397. The next prime is 16344431. The reversal of 16344421 is 12444361.

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 a de Polignac number, because none of the positive numbers 2^k-16344421 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 (16344431) 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, 355291 + ... + 355336.

It is an arithmetic number, because the mean of its divisors is an integer number (4263768).

Almost surely, 2^16344421 is an apocalyptic number.

It is an amenable number.

16344421 is a deficient number, since it is larger than the sum of its proper divisors (710651).

16344421 is an equidigital number, since it uses as much as digits as its factorization.

16344421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710650.

The product of its digits is 2304, while the sum is 25.

The square root of 16344421 is about 4042.8233946093. The cubic root of 16344421 is about 253.7794860055.

Adding to 16344421 its reverse (12444361), we get a palindrome (28788782).

The spelling of 16344421 in words is "sixteen million, three hundred forty-four thousand, four hundred twenty-one".