223012021 has 4 divisors (see below), whose sum is σ = 225311212. Its totient is φ = 220712832.

The previous prime is 223012003. The next prime is 223012033. The reversal of 223012021 is 120210322.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120210322 = 2 ⋅60105161.

It can be written as a sum of positive squares in 2 ways, for example, as 112656996 + 110355025 = 10614^2 + 10505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223012021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 223011992 and 223012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223012081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1149450 + ... + 1149643.

It is an arithmetic number, because the mean of its divisors is an integer number (56327803).

Almost surely, 2^223012021 is an apocalyptic number.

It is an amenable number.

223012021 is a deficient number, since it is larger than the sum of its proper divisors (2299191).

223012021 is an equidigital number, since it uses as much as digits as its factorization.

223012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2299190.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 223012021 is about 14933.5870104942. The cubic root of 223012021 is about 606.4235956481.

Adding to 223012021 its reverse (120210322), we get a palindrome (343222343).

The spelling of 223012021 in words is "two hundred twenty-three million, twelve thousand, twenty-one".