223321021 has 16 divisors (see below), whose sum is σ = 278801280. Its totient is φ = 173782080.

The previous prime is 223321019. The next prime is 223321037. The reversal of 223321021 is 120123322.

It is a cyclic number.

It is not a de Polignac number, because 223321021 - 2¹ = 223321019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223320986 and 223321004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223321121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75315 + ... + 78223.

It is an arithmetic number, because the mean of its divisors is an integer number (17425080).

Almost surely, 2^223321021 is an apocalyptic number.

It is an amenable number.

223321021 is a deficient number, since it is larger than the sum of its proper divisors (55480259).

223321021 is a wasteful number, since it uses less digits than its factorization.

223321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3924.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 223321021 is about 14943.9292356462. The cubic root of 223321021 is about 606.7035482884.

Adding to 223321021 its reverse (120123322), we get a palindrome (343444343).

The spelling of 223321021 in words is "two hundred twenty-three million, three hundred twenty-one thousand, twenty-one".