243064021 has 2 divisors, whose sum is σ = 243064022. Its totient is φ = 243064020.

The previous prime is 243064013. The next prime is 243064033. The reversal of 243064021 is 120460342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242923396 + 140625 = 15586^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 243064021 - 2³ = 243064013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243063983 and 243064001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243064061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121532010 + 121532011.

It is an arithmetic number, because the mean of its divisors is an integer number (121532011).

Almost surely, 2^243064021 is an apocalyptic number.

It is an amenable number.

243064021 is a deficient number, since it is larger than the sum of its proper divisors (1).

243064021 is an equidigital number, since it uses as much as digits as its factorization.

243064021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 243064021 is about 15590.5106074176. The cubic root of 243064021 is about 624.0799441803.

The spelling of 243064021 in words is "two hundred forty-three million, sixty-four thousand, twenty-one".