16244621 has 4 divisors (see below), whose sum is σ = 16253532. Its totient is φ = 16235712.

The previous prime is 16244609. The next prime is 16244623. The reversal of 16244621 is 12644261.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7214596 + 9030025 = 2686^2 + 3005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16244621 is a prime.

It is a super-2 number, since 2×16244621² = 527775422867282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16244623) 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, 620 + ... + 5733.

It is an arithmetic number, because the mean of its divisors is an integer number (4063383).

Almost surely, 2^16244621 is an apocalyptic number.

It is an amenable number.

16244621 is a deficient number, since it is larger than the sum of its proper divisors (8911).

16244621 is an equidigital number, since it uses as much as digits as its factorization.

16244621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8910.

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

The square root of 16244621 is about 4030.4616360908. The cubic root of 16244621 is about 253.2619002583.

Adding to 16244621 its reverse (12644261), we get a palindrome (28888882).

The spelling of 16244621 in words is "sixteen million, two hundred forty-four thousand, six hundred twenty-one".