243310230421 has 2 divisors, whose sum is σ = 243310230422. Its totient is φ = 243310230420.

The previous prime is 243310230407. The next prime is 243310230467. The reversal of 243310230421 is 124032013342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242841984100 + 468246321 = 492790^2 + 21639^2 .

It is a cyclic number.

It is not a de Polignac number, because 243310230421 - 2⁹ = 243310229909 is a prime.

It is a super-2 number, since 2×243310230421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243310230481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121655115210 + 121655115211.

It is an arithmetic number, because the mean of its divisors is an integer number (121655115211).

Almost surely, 2^243310230421 is an apocalyptic number.

It is an amenable number.

243310230421 is a deficient number, since it is larger than the sum of its proper divisors (1).

243310230421 is an equidigital number, since it uses as much as digits as its factorization.

243310230421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 243310230421 its reverse (124032013342), we get a palindrome (367342243763).

The spelling of 243310230421 in words is "two hundred forty-three billion, three hundred ten million, two hundred thirty thousand, four hundred twenty-one".