221323044 has 12 divisors (see below), whose sum is σ = 516420464. Its totient is φ = 73774344.

The previous prime is 221323019. The next prime is 221323049. The reversal of 221323044 is 440323122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 221323044.

It is not an unprimeable number, because it can be changed into a prime (221323049) by changing a digit.

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, 9221782 + ... + 9221805.

Almost surely, 2^221323044 is an apocalyptic number.

It is an amenable number.

221323044 is an abundant number, since it is smaller than the sum of its proper divisors (295097420).

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

221323044 is a wasteful number, since it uses less digits than its factorization.

221323044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18443594 (or 18443592 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 221323044 is about 14876.9299252231. The cubic root of 221323044 is about 604.8888022758. Note that the first 4 decimals are identical.

Adding to 221323044 its reverse (440323122), we get a palindrome (661646166).

The spelling of 221323044 in words is "two hundred twenty-one million, three hundred twenty-three thousand, forty-four".