221221044444 has 48 divisors (see below), whose sum is σ = 534443549696. Its totient is φ = 71145993600.

The previous prime is 221221044437. The next prime is 221221044449. The reversal of 221221044444 is 444440122122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221044449) 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 15 ways as a sum of consecutive naturals, for example, 775177 + ... + 1021440.

Almost surely, 2^221221044444 is an apocalyptic number.

It is an amenable number.

221221044444 is an abundant number, since it is smaller than the sum of its proper divisors (313222505252).

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

221221044444 is a wasteful number, since it uses less digits than its factorization.

221221044444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796986 (or 1796984 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 30.

Adding to 221221044444 its reverse (444440122122), we get a palindrome (665661166566).

The spelling of 221221044444 in words is "two hundred twenty-one billion, two hundred twenty-one million, forty-four thousand, four hundred forty-four".