204220001 has 4 divisors (see below), whose sum is σ = 211262100. Its totient is φ = 197177904.

The previous prime is 204219991. The next prime is 204220007. The reversal of 204220001 is 100022402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 124099600 + 80120401 = 11140^2 + 8951^2 .

It is a cyclic number.

It is not a de Polignac number, because 204220001 - 2¹⁴ = 204203617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204220007) 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, 3521006 + ... + 3521063.

It is an arithmetic number, because the mean of its divisors is an integer number (52815525).

Almost surely, 2^204220001 is an apocalyptic number.

It is an amenable number.

204220001 is a deficient number, since it is larger than the sum of its proper divisors (7042099).

204220001 is an equidigital number, since it uses as much as digits as its factorization.

204220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7042098.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 204220001 is about 14290.5563572592. The cubic root of 204220001 is about 588.8880723707. Note that the first 3 decimals are identical.

Adding to 204220001 its reverse (100022402), we get a palindrome (304242403).

The spelling of 204220001 in words is "two hundred four million, two hundred twenty thousand, one".