16424621 has 4 divisors (see below), whose sum is σ = 16622592. Its totient is φ = 16226652.

The previous prime is 16424593. The next prime is 16424623. The reversal of 16424621 is 12642461.

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 16424621 - 2⁶ = 16424557 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 (16424623) 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, 98861 + ... + 99026.

It is an arithmetic number, because the mean of its divisors is an integer number (4155648).

Almost surely, 2^16424621 is an apocalyptic number.

It is an amenable number.

16424621 is a deficient number, since it is larger than the sum of its proper divisors (197971).

16424621 is an equidigital number, since it uses as much as digits as its factorization.

16424621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197970.

The product of its digits is 2304, while the sum is 26.

The square root of 16424621 is about 4052.7300674977. The cubic root of 16424621 is about 254.1938968347.

The spelling of 16424621 in words is "sixteen million, four hundred twenty-four thousand, six hundred twenty-one".