16004621 has 2 divisors, whose sum is σ = 16004622. Its totient is φ = 16004620.

The previous prime is 16004617. The next prime is 16004647. The reversal of 16004621 is 12640061.

It is a happy number.

16004621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13586596 + 2418025 = 3686^2 + 1555^2 .

It is a cyclic number.

It is not a de Polignac number, because 16004621 - 2² = 16004617 is a prime.

It is a super-2 number, since 2×16004621² = 512295786707282, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16004593 and 16004602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16004671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8002310 + 8002311.

It is an arithmetic number, because the mean of its divisors is an integer number (8002311).

Almost surely, 2^16004621 is an apocalyptic number.

It is an amenable number.

16004621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16004621 is an equidigital number, since it uses as much as digits as its factorization.

16004621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 16004621 is about 4000.5775832997. The cubic root of 16004621 is about 252.0084663738.

Adding to 16004621 its reverse (12640061), we get a palindrome (28644682).

The spelling of 16004621 in words is "sixteen million, four thousand, six hundred twenty-one".