205315221 has 8 divisors (see below), whose sum is σ = 278393760. Its totient is φ = 134556752.

The previous prime is 205315219. The next prime is 205315241. The reversal of 205315221 is 122513502.

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 205315221 - 2¹ = 205315219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205315211) 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, 579810 + ... + 580163.

It is an arithmetic number, because the mean of its divisors is an integer number (34799220).

Almost surely, 2^205315221 is an apocalyptic number.

It is an amenable number.

205315221 is a deficient number, since it is larger than the sum of its proper divisors (73078539).

205315221 is a wasteful number, since it uses less digits than its factorization.

205315221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160035.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 205315221 is about 14328.8248296921. The cubic root of 205315221 is about 589.9389202306.

Adding to 205315221 its reverse (122513502), we get a palindrome (327828723).

It can be divided in two parts, 20531 and 5221, that added together give a palindrome (25752).

The spelling of 205315221 in words is "two hundred five million, three hundred fifteen thousand, two hundred twenty-one".