205221239 has 4 divisors (see below), whose sum is σ = 206355240. Its totient is φ = 204087240.

The previous prime is 205221227. The next prime is 205221253. The reversal of 205221239 is 932122502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205221239 - 2¹² = 205217143 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 (205221259) 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, 566729 + ... + 567090.

It is an arithmetic number, because the mean of its divisors is an integer number (51588810).

Almost surely, 2^205221239 is an apocalyptic number.

205221239 is a deficient number, since it is larger than the sum of its proper divisors (1134001).

205221239 is a wasteful number, since it uses less digits than its factorization.

205221239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134000.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 205221239 is about 14325.5449809074. The cubic root of 205221239 is about 589.8488926441.

The spelling of 205221239 in words is "two hundred five million, two hundred twenty-one thousand, two hundred thirty-nine".