204521101 has 4 divisors (see below), whose sum is σ = 216551772. Its totient is φ = 192490432.

The previous prime is 204521099. The next prime is 204521123. The reversal of 204521101 is 101125402.

204521101 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 158634025 + 45887076 = 12595^2 + 6774^2 .

It is a cyclic number.

It is not a de Polignac number, because 204521101 - 2¹ = 204521099 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 (204521501) 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, 6015310 + ... + 6015343.

It is an arithmetic number, because the mean of its divisors is an integer number (54137943).

Almost surely, 2^204521101 is an apocalyptic number.

It is an amenable number.

204521101 is a deficient number, since it is larger than the sum of its proper divisors (12030671).

204521101 is a wasteful number, since it uses less digits than its factorization.

204521101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12030670.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 204521101 is about 14301.0874062080. The cubic root of 204521101 is about 589.1773472142.

Adding to 204521101 its reverse (101125402), we get a palindrome (305646503).

The spelling of 204521101 in words is "two hundred four million, five hundred twenty-one thousand, one hundred one".