204121442455 has 32 divisors (see below), whose sum is σ = 284585356800. Its totient is φ = 137646241920.

The previous prime is 204121442453. The next prime is 204121442467. The reversal of 204121442455 is 554244121402.

It is not a de Polignac number, because 204121442455 - 2¹ = 204121442453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204121442455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204121442453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20206996 + ... + 20217094.

It is an arithmetic number, because the mean of its divisors is an integer number (8893292400).

Almost surely, 2^204121442455 is an apocalyptic number.

204121442455 is a deficient number, since it is larger than the sum of its proper divisors (80463914345).

204121442455 is a wasteful number, since it uses less digits than its factorization.

204121442455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19639.

The product of its (nonzero) digits is 51200, while the sum is 34.

Adding to 204121442455 its reverse (554244121402), we get a palindrome (758365563857).

The spelling of 204121442455 in words is "two hundred four billion, one hundred twenty-one million, four hundred forty-two thousand, four hundred fifty-five".