204421641 has 4 divisors (see below), whose sum is σ = 272562192. Its totient is φ = 136281092.

The previous prime is 204421639. The next prime is 204421643. The reversal of 204421641 is 146124402.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (204421639) and next prime (204421643).

It is a cyclic number.

It is not a de Polignac number, because 204421641 - 2¹ = 204421639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204421643) 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 3 ways as a sum of consecutive naturals, for example, 34070271 + ... + 34070276.

It is an arithmetic number, because the mean of its divisors is an integer number (68140548).

Almost surely, 2^204421641 is an apocalyptic number.

It is an amenable number.

204421641 is a deficient number, since it is larger than the sum of its proper divisors (68140551).

204421641 is an equidigital number, since it uses as much as digits as its factorization.

204421641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68140550.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 204421641 is about 14297.6096253884. The cubic root of 204421641 is about 589.0818247467.

The spelling of 204421641 in words is "two hundred four million, four hundred twenty-one thousand, six hundred forty-one".