221405344 has 24 divisors (see below), whose sum is σ = 445169088. Its totient is φ = 108346560.

The previous prime is 221405339. The next prime is 221405351. The reversal of 221405344 is 443504122.

It is a happy number.

221405344 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72102 + ... + 75109.

It is an arithmetic number, because the mean of its divisors is an integer number (18548712).

Almost surely, 2^221405344 is an apocalyptic number.

It is an amenable number.

221405344 is an abundant number, since it is smaller than the sum of its proper divisors (223763744).

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

221405344 is a wasteful number, since it uses less digits than its factorization.

221405344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147268 (or 147260 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 221405344 is about 14879.6956958131. The cubic root of 221405344 is about 604.9637698861.

Adding to 221405344 its reverse (443504122), we get a palindrome (664909466).

The spelling of 221405344 in words is "two hundred twenty-one million, four hundred five thousand, three hundred forty-four".