204113521 has 8 divisors (see below), whose sum is σ = 207191520. Its totient is φ = 201057408.

The previous prime is 204113491. The next prime is 204113563. The reversal of 204113521 is 125311402.

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 204113521 - 2¹¹ = 204111473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204113321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13825 + ... + 24481.

It is an arithmetic number, because the mean of its divisors is an integer number (25898940).

Almost surely, 2^204113521 is an apocalyptic number.

It is an amenable number.

204113521 is a deficient number, since it is larger than the sum of its proper divisors (3077999).

204113521 is a wasteful number, since it uses less digits than its factorization.

204113521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10943.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 204113521 is about 14286.8303342624. The cubic root of 204113521 is about 588.7857061271.

Adding to 204113521 its reverse (125311402), we get a palindrome (329424923).

It can be divided in two parts, 20411 and 3521, that added together give a palindrome (23932).

The spelling of 204113521 in words is "two hundred four million, one hundred thirteen thousand, five hundred twenty-one".