223031021 has 4 divisors (see below), whose sum is σ = 228470844. Its totient is φ = 217591200.

The previous prime is 223030991. The next prime is 223031057. The reversal of 223031021 is 120130322.

It is a happy number.

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 54316900 + 168714121 = 7370^2 + 12989^2 .

It is a cyclic number.

It is not a de Polignac number, because 223031021 - 2¹⁸ = 222768877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223030987 and 223031005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223031521) 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 in 3 ways as a sum of consecutive naturals, for example, 2719850 + ... + 2719931.

It is an arithmetic number, because the mean of its divisors is an integer number (57117711).

Almost surely, 2^223031021 is an apocalyptic number.

It is an amenable number.

223031021 is a deficient number, since it is larger than the sum of its proper divisors (5439823).

223031021 is an equidigital number, since it uses as much as digits as its factorization.

223031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5439822.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 223031021 is about 14934.2231468530. The cubic root of 223031021 is about 606.4408170234.

Adding to 223031021 its reverse (120130322), we get a palindrome (343161343).

The spelling of 223031021 in words is "two hundred twenty-three million, thirty-one thousand, twenty-one".