204455533412021 has 4 divisors (see below), whose sum is σ = 204471259564044. Its totient is φ = 204439807260000.

The previous prime is 204455533411963. The next prime is 204455533412027. The reversal of 204455533412021 is 120214335554402.

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 103514630517796 + 100940902894225 = 10174214^2 + 10046935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204455533412021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204455533412021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204455533412027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7863056510 + ... + 7863082511.

It is an arithmetic number, because the mean of its divisors is an integer number (51117814891011).

Almost surely, 2^{204455533412021} is an apocalyptic number.

It is an amenable number.

204455533412021 is a deficient number, since it is larger than the sum of its proper divisors (15726152023).

204455533412021 is a wasteful number, since it uses less digits than its factorization.

204455533412021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15726152022.

The product of its (nonzero) digits is 576000, while the sum is 41.

Adding to 204455533412021 its reverse (120214335554402), we get a palindrome (324669868966423).

The spelling of 204455533412021 in words is "two hundred four trillion, four hundred fifty-five billion, five hundred thirty-three million, four hundred twelve thousand, twenty-one".