16324621 has 4 divisors (see below), whose sum is σ = 16416000. Its totient is φ = 16233244.

The previous prime is 16324597. The next prime is 16324657. The reversal of 16324621 is 12642361.

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 an emirpimes, since its reverse is a distinct semiprime: 12642361 = 89 ⋅142049.

It is a cyclic number.

It is not a de Polignac number, because 16324621 - 2¹¹ = 16322573 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 (16324661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45421 + ... + 45778.

It is an arithmetic number, because the mean of its divisors is an integer number (4104000).

Almost surely, 2^16324621 is an apocalyptic number.

It is an amenable number.

16324621 is a deficient number, since it is larger than the sum of its proper divisors (91379).

16324621 is an equidigital number, since it uses as much as digits as its factorization.

16324621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91378.

The product of its digits is 1728, while the sum is 25.

The square root of 16324621 is about 4040.3738688394. The cubic root of 16324621 is about 253.6769665330.

Adding to 16324621 its reverse (12642361), we get a palindrome (28966982).

The spelling of 16324621 in words is "sixteen million, three hundred twenty-four thousand, six hundred twenty-one".