204211321 has 4 divisors (see below), whose sum is σ = 204486912. Its totient is φ = 203935732.

The previous prime is 204211307. The next prime is 204211333. The reversal of 204211321 is 123112402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204211321 - 2¹⁵ = 204178553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204211295 and 204211304.

It is not an unprimeable number, because it can be changed into a prime (204211351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136681 + ... + 138166.

It is an arithmetic number, because the mean of its divisors is an integer number (51121728).

Almost surely, 2^204211321 is an apocalyptic number.

It is an amenable number.

204211321 is a deficient number, since it is larger than the sum of its proper divisors (275591).

204211321 is an equidigital number, since it uses as much as digits as its factorization.

204211321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275590.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 204211321 is about 14290.2526569687. The cubic root of 204211321 is about 588.8797290468.

Adding to 204211321 its reverse (123112402), we get a palindrome (327323723).

The spelling of 204211321 in words is "two hundred four million, two hundred eleven thousand, three hundred twenty-one".