243443230421 has 2 divisors, whose sum is σ = 243443230422. Its totient is φ = 243443230420.

The previous prime is 243443230411. The next prime is 243443230439. The reversal of 243443230421 is 124032344342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220608696100 + 22834534321 = 469690^2 + 151111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243443230421 is a prime.

It is a super-3 number, since 3×243443230421³ (a number of 35 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243443230411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121721615210 + 121721615211.

It is an arithmetic number, because the mean of its divisors is an integer number (121721615211).

Almost surely, 2^243443230421 is an apocalyptic number.

It is an amenable number.

243443230421 is a deficient number, since it is larger than the sum of its proper divisors (1).

243443230421 is an equidigital number, since it uses as much as digits as its factorization.

243443230421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 243443230421 its reverse (124032344342), we get a palindrome (367475574763).

The spelling of 243443230421 in words is "two hundred forty-three billion, four hundred forty-three million, two hundred thirty thousand, four hundred twenty-one".