205221255 has 32 divisors (see below), whose sum is σ = 340666560. Its totient is φ = 105369600.

The previous prime is 205221253. The next prime is 205221257. The reversal of 205221255 is 552122502.

It is an interprime number because it is at equal distance from previous prime (205221253) and next prime (205221257).

It is not a de Polignac number, because 205221255 - 2¹ = 205221253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205221253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 292405 + ... + 293105.

It is an arithmetic number, because the mean of its divisors is an integer number (10645830).

Almost surely, 2^205221255 is an apocalyptic number.

205221255 is a deficient number, since it is larger than the sum of its proper divisors (135445305).

205221255 is a wasteful number, since it uses less digits than its factorization.

205221255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 205221255 is about 14325.5455393503. The cubic root of 205221255 is about 589.8489079733.

Adding to 205221255 its reverse (552122502), we get a palindrome (757343757).

The spelling of 205221255 in words is "two hundred five million, two hundred twenty-one thousand, two hundred fifty-five".