223421213 has 4 divisors (see below), whose sum is σ = 223527900. Its totient is φ = 223314528.

The previous prime is 223421189. The next prime is 223421251. The reversal of 223421213 is 312124322.

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 39601849 + 183819364 = 6293^2 + 13558^2 .

It is a cyclic number.

It is not a de Polignac number, because 223421213 - 2⁸ = 223420957 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 (223421273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50138 + ... + 54411.

It is an arithmetic number, because the mean of its divisors is an integer number (55881975).

Almost surely, 2^223421213 is an apocalyptic number.

It is an amenable number.

223421213 is a deficient number, since it is larger than the sum of its proper divisors (106687).

223421213 is a wasteful number, since it uses less digits than its factorization.

223421213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106686.

The product of its digits is 576, while the sum is 20.

The square root of 223421213 is about 14947.2811240038. The cubic root of 223421213 is about 606.7942663548.

Adding to 223421213 its reverse (312124322), we get a palindrome (535545535).

The spelling of 223421213 in words is "two hundred twenty-three million, four hundred twenty-one thousand, two hundred thirteen".