204021291 has 8 divisors (see below), whose sum is σ = 272217040. Its totient is φ = 135919872.

The previous prime is 204021263. The next prime is 204021317. The reversal of 204021291 is 192120402.

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

It is not a de Polignac number, because 204021291 - 2⁷ = 204021163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204021211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18370 + ... + 27303.

It is an arithmetic number, because the mean of its divisors is an integer number (34027130).

Almost surely, 2^204021291 is an apocalyptic number.

204021291 is a deficient number, since it is larger than the sum of its proper divisors (68195749).

204021291 is a wasteful number, since it uses less digits than its factorization.

204021291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47165.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 204021291 is about 14283.6021717212. The cubic root of 204021291 is about 588.6970105707.

Adding to 204021291 its reverse (192120402), we get a palindrome (396141693).

The spelling of 204021291 in words is "two hundred four million, twenty-one thousand, two hundred ninety-one".