221331331121 has 4 divisors (see below), whose sum is σ = 223818200100. Its totient is φ = 218844462144.

The previous prime is 221331331093. The next prime is 221331331157. The reversal of 221331331121 is 121133133122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20236485025 + 201094846096 = 142255^2 + 448436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221331331121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221331331021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1243434356 + ... + 1243434533.

It is an arithmetic number, because the mean of its divisors is an integer number (55954550025).

Almost surely, 2^221331331121 is an apocalyptic number.

It is an amenable number.

221331331121 is a deficient number, since it is larger than the sum of its proper divisors (2486868979).

221331331121 is an equidigital number, since it uses as much as digits as its factorization.

221331331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486868978.

The product of its digits is 648, while the sum is 23.

Adding to 221331331121 its reverse (121133133122), we get a palindrome (342464464243).

The spelling of 221331331121 in words is "two hundred twenty-one billion, three hundred thirty-one million, three hundred thirty-one thousand, one hundred twenty-one".