204221044340221 has 16 divisors (see below), whose sum is σ = 213141964451760. Its totient is φ = 195425529707520.

The previous prime is 204221044340219. The next prime is 204221044340239. The reversal of 204221044340221 is 122043440122402.

It can be written as a sum of positive squares in 8 ways, for example, as 138486082896121 + 65734961444100 = 11768011^2 + 8107710^2 .

It is a cyclic number.

It is not a de Polignac number, because 204221044340221 - 2¹ = 204221044340219 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 (204221044340281) 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, 74993431 + ... + 77668891.

It is an arithmetic number, because the mean of its divisors is an integer number (13321372778235).

Almost surely, 2^{204221044340221} is an apocalyptic number.

It is an amenable number.

204221044340221 is a deficient number, since it is larger than the sum of its proper divisors (8920920111539).

204221044340221 is a wasteful number, since it uses less digits than its factorization.

204221044340221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698896.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 204221044340221 its reverse (122043440122402), we get a palindrome (326264484462623).

The spelling of 204221044340221 in words is "two hundred four trillion, two hundred twenty-one billion, forty-four million, three hundred forty thousand, two hundred twenty-one".