223021 has 4 divisors (see below), whose sum is σ = 225792. Its totient is φ = 220252.

The previous prime is 223019. The next prime is 223037. The reversal of 223021 is 120322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120322 = 2 ⋅60161.

It is a cyclic number.

It is not a de Polignac number, because 223021 - 2¹ = 223019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222989 and 223007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1261 + ... + 1426.

It is an arithmetic number, because the mean of its divisors is an integer number (56448).

2²²³⁰²¹ is an apocalyptic number.

It is an amenable number.

223021 is a deficient number, since it is larger than the sum of its proper divisors (2771).

223021 is an equidigital number, since it uses as much as digits as its factorization.

223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2770.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 223021 is about 472.2509925876. The cubic root of 223021 is about 60.6431734229.

Adding to 223021 its reverse (120322), we get a palindrome (343343).

The spelling of 223021 in words is "two hundred twenty-three thousand, twenty-one", and thus it is an iban number.