204794021 has 4 divisors (see below), whose sum is σ = 204864492. Its totient is φ = 204723552.

The previous prime is 204794017. The next prime is 204794059. The reversal of 204794021 is 120497402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120497402 = 2 ⋅60248701.

It can be written as a sum of positive squares in 2 ways, for example, as 157377025 + 47416996 = 12545^2 + 6886^2 .

It is a cyclic number.

It is not a de Polignac number, because 204794021 - 2² = 204794017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204794011) 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, 30680 + ... + 36753.

It is an arithmetic number, because the mean of its divisors is an integer number (51216123).

Almost surely, 2^204794021 is an apocalyptic number.

It is an amenable number.

204794021 is a deficient number, since it is larger than the sum of its proper divisors (70471).

204794021 is an equidigital number, since it uses as much as digits as its factorization.

204794021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70470.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 204794021 is about 14310.6261568109. The cubic root of 204794021 is about 589.4393035745.

The spelling of 204794021 in words is "two hundred four million, seven hundred ninety-four thousand, twenty-one".