205221356 has 12 divisors (see below), whose sum is σ = 378039480. Its totient is φ = 97210080.

The previous prime is 205221349. The next prime is 205221377. The reversal of 205221356 is 653122502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1350065 + ... + 1350216.

It is an arithmetic number, because the mean of its divisors is an integer number (31503290).

Almost surely, 2^205221356 is an apocalyptic number.

It is an amenable number.

205221356 is a deficient number, since it is larger than the sum of its proper divisors (172818124).

205221356 is a wasteful number, since it uses less digits than its factorization.

205221356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700304 (or 2700302 counting only the distinct ones).

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

The square root of 205221356 is about 14325.5490645211. The cubic root of 205221356 is about 589.8490047383.

Adding to 205221356 its reverse (653122502), we get a palindrome (858343858).

The spelling of 205221356 in words is "two hundred five million, two hundred twenty-one thousand, three hundred fifty-six".