204533251213 has 4 divisors (see below), whose sum is σ = 204534264700. Its totient is φ = 204532237728.

The previous prime is 204533251201. The next prime is 204533251229. The reversal of 204533251213 is 312152335402.

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 can be written as a sum of positive squares in 2 ways, for example, as 171758855844 + 32774395369 = 414438^2 + 181037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204533251213 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 (204533251253) 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, 89520 + ... + 645817.

It is an arithmetic number, because the mean of its divisors is an integer number (51133566175).

Almost surely, 2^204533251213 is an apocalyptic number.

It is an amenable number.

204533251213 is a deficient number, since it is larger than the sum of its proper divisors (1013487).

204533251213 is an equidigital number, since it uses as much as digits as its factorization.

204533251213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013486.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 204533251213 its reverse (312152335402), we get a palindrome (516685586615).

The spelling of 204533251213 in words is "two hundred four billion, five hundred thirty-three million, two hundred fifty-one thousand, two hundred thirteen".