221440441 has 4 divisors (see below), whose sum is σ = 221798800. Its totient is φ = 221082084.

The previous prime is 221440423. The next prime is 221440447. The reversal of 221440441 is 144044122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221440441 - 2⁷ = 221440313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221440447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178251 + ... + 179488.

It is an arithmetic number, because the mean of its divisors is an integer number (55449700).

Almost surely, 2^221440441 is an apocalyptic number.

It is an amenable number.

221440441 is a deficient number, since it is larger than the sum of its proper divisors (358359).

221440441 is an equidigital number, since it uses as much as digits as its factorization.

221440441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358358.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 221440441 is about 14880.8750078750. The cubic root of 221440441 is about 604.9957343232.

Adding to 221440441 its reverse (144044122), we get a palindrome (365484563).

The spelling of 221440441 in words is "two hundred twenty-one million, four hundred forty thousand, four hundred forty-one".