221235444 has 18 divisors (see below), whose sum is σ = 559234130. Its totient is φ = 73745136.

The previous prime is 221235419. The next prime is 221235463. The reversal of 221235444 is 444532122.

221235444 is a `hidden beast` number, since 2 + 212 + 3 + 5 + 444 = 666.

It can be written as a sum of positive squares in only one way, i.e., 202208400 + 19027044 = 14220^2 + 4362^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3072679 + ... + 3072750.

Almost surely, 2^221235444 is an apocalyptic number.

It is an amenable number.

221235444 is an abundant number, since it is smaller than the sum of its proper divisors (337998686).

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

221235444 is a wasteful number, since it uses less digits than its factorization.

221235444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6145439 (or 6145434 counting only the distinct ones).

The product of its digits is 7680, while the sum is 27.

The square root of 221235444 is about 14873.9854780082. The cubic root of 221235444 is about 604.8089864395.

Adding to 221235444 its reverse (444532122), we get a palindrome (665767566).

The spelling of 221235444 in words is "two hundred twenty-one million, two hundred thirty-five thousand, four hundred forty-four".