204541010042221 has 16 divisors (see below), whose sum is σ = 211257753482160. Its totient is φ = 197912940305920.

The previous prime is 204541010042189. The next prime is 204541010042249. The reversal of 204541010042221 is 122240010145402.

It can be written as a sum of positive squares in 8 ways, for example, as 26355594412900 + 178185415629321 = 5133770^2 + 13348611^2 .

It is a cyclic number.

It is not a de Polignac number, because 204541010042221 - 2⁵ = 204541010042189 is a prime.

It is a super-2 number, since 2×204541010042221² (a number of 29 digits) contains 22 as substring.

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 204541010042221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204541010046221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37382626 + ... + 42503443.

It is an arithmetic number, because the mean of its divisors is an integer number (13203609592635).

Almost surely, 2^{204541010042221} is an apocalyptic number.

It is an amenable number.

204541010042221 is a deficient number, since it is larger than the sum of its proper divisors (6716743439939).

204541010042221 is a wasteful number, since it uses less digits than its factorization.

204541010042221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79886624.

The product of its (nonzero) digits is 5120, while the sum is 28.

Adding to 204541010042221 its reverse (122240010145402), we get a palindrome (326781020187623).

The spelling of 204541010042221 in words is "two hundred four trillion, five hundred forty-one billion, ten million, forty-two thousand, two hundred twenty-one".