2004521 has 8 divisors (see below), whose sum is σ = 2158344. Its totient is φ = 1854720.

The previous prime is 2004511. The next prime is 2004529. The reversal of 2004521 is 1254002.

It can be written as a sum of positive squares in 4 ways, for example, as 211600 + 1792921 = 460^2 + 1339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2004521 - 2¹⁰ = 2003497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2004496 and 2004505.

It is not an unprimeable number, because it can be changed into a prime (2004529) 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 7 ways as a sum of consecutive naturals, for example, 71 + ... + 2003.

It is an arithmetic number, because the mean of its divisors is an integer number (269793).

2^2004521 is an apocalyptic number.

It is an amenable number.

2004521 is a deficient number, since it is larger than the sum of its proper divisors (153823).

2004521 is a wasteful number, since it uses less digits than its factorization.

2004521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 2004521 is about 1415.8110749673. The cubic root of 2004521 is about 126.0869685967.

Adding to 2004521 its reverse (1254002), we get a palindrome (3258523).

The spelling of 2004521 in words is "two million, four thousand, five hundred twenty-one".