221320211 has 6 divisors (see below), whose sum is σ = 257454180. Its totient is φ = 189702996.

The previous prime is 221320201. The next prime is 221320213. The reversal of 221320211 is 112023122.

It is a happy number.

It is not a de Polignac number, because 221320211 - 2¹⁰ = 221319187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221320213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2258321 + ... + 2258418.

It is an arithmetic number, because the mean of its divisors is an integer number (42909030).

Almost surely, 2^221320211 is an apocalyptic number.

221320211 is a deficient number, since it is larger than the sum of its proper divisors (36133969).

221320211 is an equidigital number, since it uses as much as digits as its factorization.

221320211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516753 (or 4516746 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221320211 is about 14876.8347103811. The cubic root of 221320211 is about 604.8862213467.

Adding to 221320211 its reverse (112023122), we get a palindrome (333343333).

The spelling of 221320211 in words is "two hundred twenty-one million, three hundred twenty thousand, two hundred eleven".