205023534221 has 8 divisors (see below), whose sum is σ = 223756958304. Its totient is φ = 186305930320.

The previous prime is 205023534217. The next prime is 205023534227. The reversal of 205023534221 is 122435320502.

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

It is a cyclic number.

It is not a de Polignac number, because 205023534221 - 2² = 205023534217 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205023534227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3927935 + ... + 3979788.

It is an arithmetic number, because the mean of its divisors is an integer number (27969619788).

Almost surely, 2^205023534221 is an apocalyptic number.

It is an amenable number.

205023534221 is a deficient number, since it is larger than the sum of its proper divisors (18733424083).

205023534221 is a wasteful number, since it uses less digits than its factorization.

205023534221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7910091.

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 205023534221 its reverse (122435320502), we get a palindrome (327458854723).

The spelling of 205023534221 in words is "two hundred five billion, twenty-three million, five hundred thirty-four thousand, two hundred twenty-one".