221144433 has 4 divisors (see below), whose sum is σ = 294859248. Its totient is φ = 147429620.

The previous prime is 221144419. The next prime is 221144437. The reversal of 221144433 is 334441122.

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 221144433 - 2⁶ = 221144369 is a prime.

It is a Curzon number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (221144437) 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, 36857403 + ... + 36857408.

It is an arithmetic number, because the mean of its divisors is an integer number (73714812).

Almost surely, 2^221144433 is an apocalyptic number.

It is an amenable number.

221144433 is a deficient number, since it is larger than the sum of its proper divisors (73714815).

221144433 is an equidigital number, since it uses as much as digits as its factorization.

221144433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73714814.

The product of its digits is 2304, while the sum is 24.

The square root of 221144433 is about 14870.9257613640. The cubic root of 221144433 is about 604.7260403868.

Adding to 221144433 its reverse (334441122), we get a palindrome (555585555).

The spelling of 221144433 in words is "two hundred twenty-one million, one hundred forty-four thousand, four hundred thirty-three".