223444021 has 8 divisors (see below), whose sum is σ = 227060120. Its totient is φ = 219843072.

The previous prime is 223443967. The next prime is 223444027. The reversal of 223444021 is 120444322.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3663396 + 219780625 = 1914^2 + 14825^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 223444021 - 2⁷ = 223443893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223443983 and 223444001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223444027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28075 + ... + 35143.

It is an arithmetic number, because the mean of its divisors is an integer number (28382515).

Almost surely, 2^223444021 is an apocalyptic number.

It is an amenable number.

223444021 is a deficient number, since it is larger than the sum of its proper divisors (3616099).

223444021 is an equidigital number, since it uses as much as digits as its factorization.

223444021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7575.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 223444021 is about 14948.0440526512. The cubic root of 223444021 is about 606.8149138909.

Adding to 223444021 its reverse (120444322), we get a palindrome (343888343).

The spelling of 223444021 in words is "two hundred twenty-three million, four hundred forty-four thousand, twenty-one".