205504221 has 8 divisors (see below), whose sum is σ = 295083040. Its totient is φ = 126464112.

The previous prime is 205504213. The next prime is 205504231. The reversal of 205504221 is 122405502.

It is a happy number.

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

It is not a de Polignac number, because 205504221 - 2³ = 205504213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205504231) 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, 2634631 + ... + 2634708.

It is an arithmetic number, because the mean of its divisors is an integer number (36885380).

Almost surely, 2^205504221 is an apocalyptic number.

It is an amenable number.

205504221 is a deficient number, since it is larger than the sum of its proper divisors (89578819).

205504221 is a wasteful number, since it uses less digits than its factorization.

205504221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5269355.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 205504221 is about 14335.4184103569. The cubic root of 205504221 is about 590.1198846684.

Adding to 205504221 its reverse (122405502), we get a palindrome (327909723).

The spelling of 205504221 in words is "two hundred five million, five hundred four thousand, two hundred twenty-one".