204234521 has 2 divisors, whose sum is σ = 204234522. Its totient is φ = 204234520.

The previous prime is 204234517. The next prime is 204234539. The reversal of 204234521 is 125432402.

It is a happy number.

204234521 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., 132595225 + 71639296 = 11515^2 + 8464^2 .

It is a cyclic number.

It is not a de Polignac number, because 204234521 - 2² = 204234517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204234551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102117260 + 102117261.

It is an arithmetic number, because the mean of its divisors is an integer number (102117261).

Almost surely, 2^204234521 is an apocalyptic number.

It is an amenable number.

204234521 is a deficient number, since it is larger than the sum of its proper divisors (1).

204234521 is an equidigital number, since it uses as much as digits as its factorization.

204234521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 204234521 is about 14291.0643760358. The cubic root of 204234521 is about 588.9020286469.

Adding to 204234521 its reverse (125432402), we get a palindrome (329666923).

It can be divided in two parts, 2042 and 34521, that added together give a palindrome (36563).

The spelling of 204234521 in words is "two hundred four million, two hundred thirty-four thousand, five hundred twenty-one".