205536221 has 16 divisors (see below), whose sum is σ = 231100800. Its totient is φ = 181154880.

The previous prime is 205536203. The next prime is 205536223. The reversal of 205536221 is 122635502.

205536221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 205536221 - 2¹⁸ = 205274077 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 (205536223) 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, 141320 + ... + 142766.

It is an arithmetic number, because the mean of its divisors is an integer number (14443800).

Almost surely, 2^205536221 is an apocalyptic number.

It is an amenable number.

205536221 is a deficient number, since it is larger than the sum of its proper divisors (25564579).

205536221 is a wasteful number, since it uses less digits than its factorization.

205536221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 205536221 is about 14336.5344836191. The cubic root of 205536221 is about 590.1505131654.

The spelling of 205536221 in words is "two hundred five million, five hundred thirty-six thousand, two hundred twenty-one".