204210120221 has 8 divisors (see below), whose sum is σ = 216259252920. Its totient is φ = 192165073408.

The previous prime is 204210120173. The next prime is 204210120277. The reversal of 204210120221 is 122021012402.

It can be written as a sum of positive squares in 4 ways, for example, as 163005180121 + 41204940100 = 403739^2 + 202990^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204210120221 - 2⁶ = 204210120157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 204210120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204210120721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 918266 + ... + 1118763.

It is an arithmetic number, because the mean of its divisors is an integer number (27032406615).

Almost surely, 2^204210120221 is an apocalyptic number.

It is an amenable number.

204210120221 is a deficient number, since it is larger than the sum of its proper divisors (12049132699).

204210120221 is a wasteful number, since it uses less digits than its factorization.

204210120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042943.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 204210120221 its reverse (122021012402), we get a palindrome (326231132623).

The spelling of 204210120221 in words is "two hundred four billion, two hundred ten million, one hundred twenty thousand, two hundred twenty-one".