204220221 has 16 divisors (see below), whose sum is σ = 283109568. Its totient is φ = 130838400.

The previous prime is 204220199. The next prime is 204220229. The reversal of 204220221 is 122022402.

204220221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204220221 - 2¹⁸ = 203958077 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 204220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204220229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4150 + ... + 20631.

It is an arithmetic number, because the mean of its divisors is an integer number (17694348).

Almost surely, 2^204220221 is an apocalyptic number.

It is an amenable number.

204220221 is a deficient number, since it is larger than the sum of its proper divisors (78889347).

204220221 is a wasteful number, since it uses less digits than its factorization.

204220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24892.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 204220221 is about 14290.5640546481. The cubic root of 204220221 is about 588.8882838344. Note that the first 3 decimals are identical.

Adding to 204220221 its reverse (122022402), we get a palindrome (326242623).

The spelling of 204220221 in words is "two hundred four million, two hundred twenty thousand, two hundred twenty-one".