204631221 has 8 divisors (see below), whose sum is σ = 282250080. Its totient is φ = 131716592.

The previous prime is 204631211. The next prime is 204631223. The reversal of 204631221 is 122136402.

204631221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204631221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204631223) 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, 1175955 + ... + 1176128.

It is an arithmetic number, because the mean of its divisors is an integer number (35281260).

Almost surely, 2^204631221 is an apocalyptic number.

It is an amenable number.

204631221 is a deficient number, since it is larger than the sum of its proper divisors (77618859).

204631221 is a wasteful number, since it uses less digits than its factorization.

204631221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2352115.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 204631221 is about 14304.9369449851. The cubic root of 204631221 is about 589.2830715432.

Adding to 204631221 its reverse (122136402), we get a palindrome (326767623).

The spelling of 204631221 in words is "two hundred four million, six hundred thirty-one thousand, two hundred twenty-one".