205445012521 has 8 divisors (see below), whose sum is σ = 235629869184. Its totient is φ = 175469048160.

The previous prime is 205445012501. The next prime is 205445012567. The reversal of 205445012521 is 125210544502.

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

It is not a de Polignac number, because 205445012521 - 2¹³ = 205445004329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205445012501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52220965 + ... + 52224898.

It is an arithmetic number, because the mean of its divisors is an integer number (29453733648).

Almost surely, 2^205445012521 is an apocalyptic number.

It is an amenable number.

205445012521 is a deficient number, since it is larger than the sum of its proper divisors (30184856663).

205445012521 is a wasteful number, since it uses less digits than its factorization.

205445012521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104446151.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 205445012521 in words is "two hundred five billion, four hundred forty-five million, twelve thousand, five hundred twenty-one".