221211232111 has 4 divisors (see below), whose sum is σ = 230829111792. Its totient is φ = 211593352432.

The previous prime is 221211232087. The next prime is 221211232117. The reversal of 221211232111 is 111232112122.

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 221211232111 - 2¹¹ = 221211230063 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 (221211232117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4808939806 + ... + 4808939851.

It is an arithmetic number, because the mean of its divisors is an integer number (57707277948).

Almost surely, 2^221211232111 is an apocalyptic number.

221211232111 is a deficient number, since it is larger than the sum of its proper divisors (9617879681).

221211232111 is an equidigital number, since it uses as much as digits as its factorization.

221211232111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9617879680.

The product of its digits is 96, while the sum is 19.

Adding to 221211232111 its reverse (111232112122), we get a palindrome (332443344233).

The spelling of 221211232111 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred thirty-two thousand, one hundred eleven".