204155250521 has 4 divisors (see below), whose sum is σ = 204171259152. Its totient is φ = 204139241892.

The previous prime is 204155250463. The next prime is 204155250547. The reversal of 204155250521 is 125052551402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204155250521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204155250721) 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, 7985171 + ... + 8010696.

It is an arithmetic number, because the mean of its divisors is an integer number (51042814788).

Almost surely, 2^204155250521 is an apocalyptic number.

It is an amenable number.

204155250521 is a deficient number, since it is larger than the sum of its proper divisors (16008631).

204155250521 is a wasteful number, since it uses less digits than its factorization.

204155250521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16008630.

The product of its (nonzero) digits is 20000, while the sum is 32.

The spelling of 204155250521 in words is "two hundred four billion, one hundred fifty-five million, two hundred fifty thousand, five hundred twenty-one".