221443041424 has 80 divisors (see below), whose sum is σ = 475359128640. Its totient is φ = 99095892480.

The previous prime is 221443041401. The next prime is 221443041493. The reversal of 221443041424 is 424140344122.

It is a happy number.

It is a super-2 number, since 2×221443041424² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2975127 + ... + 3048649.

It is an arithmetic number, because the mean of its divisors is an integer number (5941989108).

Almost surely, 2^221443041424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221443041424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237679564320).

221443041424 is an abundant number, since it is smaller than the sum of its proper divisors (253916087216).

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

221443041424 is a wasteful number, since it uses less digits than its factorization.

221443041424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73808 (or 73802 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 221443041424 its reverse (424140344122), we get a palindrome (645583385546).

The spelling of 221443041424 in words is "two hundred twenty-one billion, four hundred forty-three million, forty-one thousand, four hundred twenty-four".