204213265261 has 16 divisors (see below), whose sum is σ = 208264089600. Its totient is φ = 200194278768.

The previous prime is 204213265253. The next prime is 204213265279. The reversal of 204213265261 is 162562312402.

It is a cyclic number.

It is not a de Polignac number, because 204213265261 - 2³ = 204213265253 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 (204213269261) 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, 12090220 + ... + 12107098.

It is an arithmetic number, because the mean of its divisors is an integer number (13016505600).

Almost surely, 2^204213265261 is an apocalyptic number.

It is an amenable number.

204213265261 is a deficient number, since it is larger than the sum of its proper divisors (4050824339).

204213265261 is a wasteful number, since it uses less digits than its factorization.

204213265261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17808.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 204213265261 its reverse (162562312402), we get a palindrome (366775577663).

The spelling of 204213265261 in words is "two hundred four billion, two hundred thirteen million, two hundred sixty-five thousand, two hundred sixty-one".