204865212271 has 4 divisors (see below), whose sum is σ = 204866123544. Its totient is φ = 204864301000.

The previous prime is 204865212257. The next prime is 204865212287. The reversal of 204865212271 is 172212568402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 204865212271 - 2¹⁵ = 204865179503 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204865215271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149316 + ... + 657286.

It is an arithmetic number, because the mean of its divisors is an integer number (51216530886).

Almost surely, 2^204865212271 is an apocalyptic number.

204865212271 is a deficient number, since it is larger than the sum of its proper divisors (911273).

204865212271 is an equidigital number, since it uses as much as digits as its factorization.

204865212271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911272.

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 204865212271 in words is "two hundred four billion, eight hundred sixty-five million, two hundred twelve thousand, two hundred seventy-one".