223444421 has 4 divisors (see below), whose sum is σ = 225656844. Its totient is φ = 221232000.

The previous prime is 223444409. The next prime is 223444453. The reversal of 223444421 is 124444322.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 169260100 + 54184321 = 13010^2 + 7361^2 .

It is a cyclic number.

It is not a de Polignac number, because 223444421 - 2⁶ = 223444357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223444121) 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, 1106060 + ... + 1106261.

It is an arithmetic number, because the mean of its divisors is an integer number (56414211).

Almost surely, 2^223444421 is an apocalyptic number.

It is an amenable number.

223444421 is a deficient number, since it is larger than the sum of its proper divisors (2212423).

223444421 is a wasteful number, since it uses less digits than its factorization.

223444421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212422.

The product of its digits is 6144, while the sum is 26.

The square root of 223444421 is about 14948.0574323221. The cubic root of 223444421 is about 606.8152759888.

Adding to 223444421 its reverse (124444322), we get a palindrome (347888743).

Subtracting from 223444421 its reverse (124444322), we obtain a palindrome (99000099).

It can be divided in two parts, 22 and 3444421, that added together give a palindrome (3444443).

The spelling of 223444421 in words is "two hundred twenty-three million, four hundred forty-four thousand, four hundred twenty-one".