221313271 has 4 divisors (see below), whose sum is σ = 226022112. Its totient is φ = 216604432.

The previous prime is 221313269. The next prime is 221313277. The reversal of 221313271 is 172313122.

It is a happy number.

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 221313271 - 2¹ = 221313269 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 (221313277) by changing a digit.

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, 2354350 + ... + 2354443.

It is an arithmetic number, because the mean of its divisors is an integer number (56505528).

Almost surely, 2^221313271 is an apocalyptic number.

221313271 is a deficient number, since it is larger than the sum of its proper divisors (4708841).

221313271 is an equidigital number, since it uses as much as digits as its factorization.

221313271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708840.

The product of its digits is 504, while the sum is 22.

The square root of 221313271 is about 14876.6014600110. The cubic root of 221313271 is about 604.8798987516.

Adding to 221313271 its reverse (172313122), we get a palindrome (393626393).

The spelling of 221313271 in words is "two hundred twenty-one million, three hundred thirteen thousand, two hundred seventy-one".