221231221111144 has 64 divisors (see below), whose sum is σ = 454483618502400. Its totient is φ = 100490214988800.

The previous prime is 221231221111111. The next prime is 221231221111213. The reversal of 221231221111144 is 441111122132122.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5859189 + ... + 21835579.

It is an arithmetic number, because the mean of its divisors is an integer number (7101306539100).

Almost surely, 2^{221231221111144} is an apocalyptic number.

It is an amenable number.

221231221111144 is an abundant number, since it is smaller than the sum of its proper divisors (233252397391256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221231221111144 is a wasteful number, since it uses less digits than its factorization.

221231221111144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15979954 (or 15979950 counting only the distinct ones).

The product of its digits is 1536, while the sum is 28.

Adding to 221231221111144 its reverse (441111122132122), we get a palindrome (662342343243266).

The spelling of 221231221111144 in words is "two hundred twenty-one trillion, two hundred thirty-one billion, two hundred twenty-one million, one hundred eleven thousand, one hundred forty-four".