204553341721 has 16 divisors (see below), whose sum is σ = 219458859840. Its totient is φ = 189983472640.

The previous prime is 204553341701. The next prime is 204553341743. The reversal of 204553341721 is 127143355402.

It is a cyclic number.

It is not a de Polignac number, because 204553341721 - 2¹³ = 204553333529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204553341701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142065 + ... + 655201.

It is an arithmetic number, because the mean of its divisors is an integer number (13716178740).

Almost surely, 2^204553341721 is an apocalyptic number.

It is an amenable number.

204553341721 is a deficient number, since it is larger than the sum of its proper divisors (14905518119).

204553341721 is a wasteful number, since it uses less digits than its factorization.

204553341721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513464.

The product of its (nonzero) digits is 100800, while the sum is 37.

The spelling of 204553341721 in words is "two hundred four billion, five hundred fifty-three million, three hundred forty-one thousand, seven hundred twenty-one".