221412544 has 28 divisors (see below), whose sum is σ = 442544200. Its totient is φ = 109905408.

The previous prime is 221412523. The next prime is 221412553. The reversal of 221412544 is 445214122.

It is an unprimeable number.

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, 3549 + ... + 21340.

It is an arithmetic number, because the mean of its divisors is an integer number (15805150).

Almost surely, 2^221412544 is an apocalyptic number.

It is an amenable number.

221412544 is a deficient number, since it is larger than the sum of its proper divisors (221131656).

221412544 is a wasteful number, since it uses less digits than its factorization.

221412544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25040 (or 25030 counting only the distinct ones).

The product of its digits is 2560, while the sum is 25.

The square root of 221412544 is about 14879.9376342779. The cubic root of 221412544 is about 604.9703275295.

Adding to 221412544 its reverse (445214122), we get a palindrome (666626666).

The spelling of 221412544 in words is "two hundred twenty-one million, four hundred twelve thousand, five hundred forty-four".