243121223 has 2 divisors, whose sum is σ = 243121224. Its totient is φ = 243121222.

The previous prime is 243121213. The next prime is 243121231. The reversal of 243121223 is 322121342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243121223 - 2⁸ = 243120967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243121195 and 243121204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560611 + 121560612.

It is an arithmetic number, because the mean of its divisors is an integer number (121560612).

Almost surely, 2^243121223 is an apocalyptic number.

243121223 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121223 is an equidigital number, since it uses as much as digits as its factorization.

243121223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 20.

The square root of 243121223 is about 15592.3450128581. The cubic root of 243121223 is about 624.1288967440.

Adding to 243121223 its reverse (322121342), we get a palindrome (565242565).

The spelling of 243121223 in words is "two hundred forty-three million, one hundred twenty-one thousand, two hundred twenty-three".