221332312211 has 4 divisors (see below), whose sum is σ = 221415553800. Its totient is φ = 221249070624.

The previous prime is 221332312193. The next prime is 221332312231. The reversal of 221332312211 is 112213233122.

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 221332312211 - 2¹⁸ = 221332050067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221332312231) 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, 41616806 + ... + 41622123.

It is an arithmetic number, because the mean of its divisors is an integer number (55353888450).

Almost surely, 2^221332312211 is an apocalyptic number.

221332312211 is a deficient number, since it is larger than the sum of its proper divisors (83241589).

221332312211 is an equidigital number, since it uses as much as digits as its factorization.

221332312211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83241588.

The product of its digits is 864, while the sum is 23.

Adding to 221332312211 its reverse (112213233122), we get a palindrome (333545545333).

The spelling of 221332312211 in words is "two hundred twenty-one billion, three hundred thirty-two million, three hundred twelve thousand, two hundred eleven".