201221255 has 4 divisors (see below), whose sum is σ = 241465512. Its totient is φ = 160977000.

The previous prime is 201221243. The next prime is 201221261. The reversal of 201221255 is 552122102.

It is a happy number.

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

It is not a de Polignac number, because 201221255 - 2¹⁶ = 201155719 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 20122121 + ... + 20122130.

It is an arithmetic number, because the mean of its divisors is an integer number (60366378).

Almost surely, 2^201221255 is an apocalyptic number.

201221255 is a deficient number, since it is larger than the sum of its proper divisors (40244257).

201221255 is an equidigital number, since it uses as much as digits as its factorization.

201221255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40244256.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 201221255 is about 14185.2477948043. The cubic root of 201221255 is about 585.9914567746.

Adding to 201221255 its reverse (552122102), we get a palindrome (753343357).

The spelling of 201221255 in words is "two hundred one million, two hundred twenty-one thousand, two hundred fifty-five".