221105424 has 20 divisors (see below), whose sum is σ = 571189136. Its totient is φ = 73701792.

The previous prime is 221105369. The next prime is 221105449. The reversal of 221105424 is 424501122.

221105424 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221105424.

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, 2303134 + ... + 2303229.

Almost surely, 2^221105424 is an apocalyptic number.

221105424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221105424 is an abundant number, since it is smaller than the sum of its proper divisors (350083712).

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

221105424 is a wasteful number, since it uses less digits than its factorization.

221105424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4606374 (or 4606368 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 221105424 is about 14869.6141173872. The cubic root of 221105424 is about 604.6904812050.

Adding to 221105424 its reverse (424501122), we get a palindrome (645606546).

The spelling of 221105424 in words is "two hundred twenty-one million, one hundred five thousand, four hundred twenty-four".