204113144021 has 4 divisors (see below), whose sum is σ = 204116733612. Its totient is φ = 204109554432.

The previous prime is 204113144003. The next prime is 204113144051. The reversal of 204113144021 is 120441311402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120441311402 = 2 ⋅60220655701.

It can be written as a sum of positive squares in 2 ways, for example, as 188170293796 + 15942850225 = 433786^2 + 126265^2 .

It is a cyclic number.

It is not a de Polignac number, because 204113144021 - 2¹⁸ = 204112881877 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 (204113144051) 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, 1708106 + ... + 1823691.

It is an arithmetic number, because the mean of its divisors is an integer number (51029183403).

Almost surely, 2^204113144021 is an apocalyptic number.

It is an amenable number.

204113144021 is a deficient number, since it is larger than the sum of its proper divisors (3589591).

204113144021 is an equidigital number, since it uses as much as digits as its factorization.

204113144021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589590.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 204113144021 its reverse (120441311402), we get a palindrome (324554455423).

The spelling of 204113144021 in words is "two hundred four billion, one hundred thirteen million, one hundred forty-four thousand, twenty-one".