223242421 has 4 divisors (see below), whose sum is σ = 225452844. Its totient is φ = 221032000.

The previous prime is 223242403. The next prime is 223242443. The reversal of 223242421 is 124242322.

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 195300625 + 27941796 = 13975^2 + 5286^2 .

It is a cyclic number.

It is not a de Polignac number, because 223242421 - 2¹⁵ = 223209653 is a prime.

It is a super-3 number, since 3×223242421³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223242392 and 223242401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223242451) 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, 1105060 + ... + 1105261.

It is an arithmetic number, because the mean of its divisors is an integer number (56363211).

Almost surely, 2^223242421 is an apocalyptic number.

It is an amenable number.

223242421 is a deficient number, since it is larger than the sum of its proper divisors (2210423).

223242421 is a wasteful number, since it uses less digits than its factorization.

223242421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210422.

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

The square root of 223242421 is about 14941.2991737667. The cubic root of 223242421 is about 606.6323615361.

Adding to 223242421 its reverse (124242322), we get a palindrome (347484743).

Subtracting from 223242421 its reverse (124242322), we obtain a palindrome (99000099).

The spelling of 223242421 in words is "two hundred twenty-three million, two hundred forty-two thousand, four hundred twenty-one".