223144021 has 2 divisors, whose sum is σ = 223144022. Its totient is φ = 223144020.

The previous prime is 223144013. The next prime is 223144063. The reversal of 223144021 is 120441322.

223144021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222904900 + 239121 = 14930^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 223144021 - 2³ = 223144013 is a prime.

It is a super-3 number, since 3×223144021³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 223144021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223144001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111572010 + 111572011.

It is an arithmetic number, because the mean of its divisors is an integer number (111572011).

Almost surely, 2^223144021 is an apocalyptic number.

It is an amenable number.

223144021 is a deficient number, since it is larger than the sum of its proper divisors (1).

223144021 is an equidigital number, since it uses as much as digits as its factorization.

223144021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 223144021 is about 14938.0059244867. The cubic root of 223144021 is about 606.5432186862.

Adding to 223144021 its reverse (120441322), we get a palindrome (343585343).

It can be divided in two parts, 22314 and 4021, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 223144021 in words is "two hundred twenty-three million, one hundred forty-four thousand, twenty-one".