223305021 has 12 divisors (see below), whose sum is σ = 322739872. Its totient is φ = 148783176.

The previous prime is 223304993. The next prime is 223305023. The reversal of 223305021 is 120503322.

It is not a de Polignac number, because 223305021 - 2¹⁷ = 223173949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223304985 and 223305003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223305023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11640 + ... + 24126.

Almost surely, 2^223305021 is an apocalyptic number.

It is an amenable number.

223305021 is a deficient number, since it is larger than the sum of its proper divisors (99434851).

223305021 is a wasteful number, since it uses less digits than its factorization.

223305021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14480 (or 14477 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 223305021 is about 14943.3938916165. The cubic root of 223305021 is about 606.6890587007.

Adding to 223305021 its reverse (120503322), we get a palindrome (343808343).

The spelling of 223305021 in words is "two hundred twenty-three million, three hundred five thousand, twenty-one".