204250021 has 4 divisors (see below), whose sum is σ = 207598444. Its totient is φ = 200901600.

The previous prime is 204250009. The next prime is 204250061. The reversal of 204250021 is 120052402.

204250021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 73719396 + 130530625 = 8586^2 + 11425^2 .

It is a cyclic number.

It is not a de Polignac number, because 204250021 - 2²⁷ = 70032293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204249977 and 204250004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204250061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1674120 + ... + 1674241.

It is an arithmetic number, because the mean of its divisors is an integer number (51899611).

Almost surely, 2^204250021 is an apocalyptic number.

It is an amenable number.

204250021 is a deficient number, since it is larger than the sum of its proper divisors (3348423).

204250021 is an equidigital number, since it uses as much as digits as its factorization.

204250021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348422.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 204250021 is about 14291.6066626534. The cubic root of 204250021 is about 588.9169261456.

The spelling of 204250021 in words is "two hundred four million, two hundred fifty thousand, twenty-one".