204000222221 has 4 divisors (see below), whose sum is σ = 204001128000. Its totient is φ = 203999316444.

The previous prime is 204000222187. The next prime is 204000222259. The reversal of 204000222221 is 122222000402.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 204000222221 - 2¹⁰ = 204000221197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204000222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204000222271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176510 + ... + 662688.

It is an arithmetic number, because the mean of its divisors is an integer number (51000282000).

Almost surely, 2^204000222221 is an apocalyptic number.

It is an amenable number.

204000222221 is a deficient number, since it is larger than the sum of its proper divisors (905779).

204000222221 is an equidigital number, since it uses as much as digits as its factorization.

204000222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905778.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 204000222221 its reverse (122222000402), we get a palindrome (326222222623).

The spelling of 204000222221 in words is "two hundred four billion, two hundred twenty-two thousand, two hundred twenty-one".