204221405 has 16 divisors (see below), whose sum is σ = 263968320. Its totient is φ = 151175808.

The previous prime is 204221387. The next prime is 204221411. The reversal of 204221405 is 504122402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 204221405 - 2¹² = 204217309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20912 + ... + 29081.

It is an arithmetic number, because the mean of its divisors is an integer number (16498020).

Almost surely, 2^204221405 is an apocalyptic number.

It is an amenable number.

204221405 is a deficient number, since it is larger than the sum of its proper divisors (59746915).

204221405 is a wasteful number, since it uses less digits than its factorization.

204221405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50060.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 204221405 is about 14290.6054805246. The cubic root of 204221405 is about 588.8894218908.

Adding to 204221405 its reverse (504122402), we get a palindrome (708343807).

The spelling of 204221405 in words is "two hundred four million, two hundred twenty-one thousand, four hundred five".