223443421 has 2 divisors, whose sum is σ = 223443422. Its totient is φ = 223443420.

The previous prime is 223443397. The next prime is 223443433. The reversal of 223443421 is 124344322.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134235396 + 89208025 = 11586^2 + 9445^2 .

It is a cyclic number.

It is not a de Polignac number, because 223443421 - 2⁷ = 223443293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223443491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111721710 + 111721711.

It is an arithmetic number, because the mean of its divisors is an integer number (111721711).

Almost surely, 2^223443421 is an apocalyptic number.

It is an amenable number.

223443421 is a deficient number, since it is larger than the sum of its proper divisors (1).

223443421 is an equidigital number, since it uses as much as digits as its factorization.

223443421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 25.

The square root of 223443421 is about 14948.0239831223. The cubic root of 223443421 is about 606.8143707433.

Adding to 223443421 its reverse (124344322), we get a palindrome (347787743).

Subtracting from 223443421 its reverse (124344322), we obtain a palindrome (99099099).

It can be divided in two parts, 22 and 3443421, that added together give a palindrome (3443443).

The spelling of 223443421 in words is "two hundred twenty-three million, four hundred forty-three thousand, four hundred twenty-one".