243055230421 has 2 divisors, whose sum is σ = 243055230422. Its totient is φ = 243055230420.

The previous prime is 243055230419. The next prime is 243055230427. The reversal of 243055230421 is 124032550342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219856894321 + 23198336100 = 468889^2 + 152310^2 .

It is a cyclic number.

It is not a de Polignac number, because 243055230421 - 2¹ = 243055230419 is a prime.

Together with 243055230419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243055230427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121527615210 + 121527615211.

It is an arithmetic number, because the mean of its divisors is an integer number (121527615211).

Almost surely, 2^243055230421 is an apocalyptic number.

It is an amenable number.

243055230421 is a deficient number, since it is larger than the sum of its proper divisors (1).

243055230421 is an equidigital number, since it uses as much as digits as its factorization.

243055230421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 243055230421 its reverse (124032550342), we get a palindrome (367087780763).

The spelling of 243055230421 in words is "two hundred forty-three billion, fifty-five million, two hundred thirty thousand, four hundred twenty-one".