205033421 has 4 divisors (see below), whose sum is σ = 207842172. Its totient is φ = 202224672.

The previous prime is 205033399. The next prime is 205033501. The reversal of 205033421 is 124330502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130210921 + 74822500 = 11411^2 + 8650^2 .

It is a cyclic number.

It is not a de Polignac number, because 205033421 - 2¹⁰ = 205032397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205033393 and 205033402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205033121) 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, 1404266 + ... + 1404411.

It is an arithmetic number, because the mean of its divisors is an integer number (51960543).

Almost surely, 2^205033421 is an apocalyptic number.

It is an amenable number.

205033421 is a deficient number, since it is larger than the sum of its proper divisors (2808751).

205033421 is an equidigital number, since it uses as much as digits as its factorization.

205033421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808750.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 205033421 is about 14318.9881276576. The cubic root of 205033421 is about 589.6688949442.

Adding to 205033421 its reverse (124330502), we get a palindrome (329363923).

The spelling of 205033421 in words is "two hundred five million, thirty-three thousand, four hundred twenty-one".