4243131210421 has 2 divisors, whose sum is σ = 4243131210422. Its totient is φ = 4243131210420.

The previous prime is 4243131210359. The next prime is 4243131210443. The reversal of 4243131210421 is 1240121313424.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3566485128196 + 676646082225 = 1888514^2 + 822585^2 .

It is a cyclic number.

It is not a de Polignac number, because 4243131210421 - 2⁹ = 4243131209909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4243131210421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4243131210481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121565605210 + 2121565605211.

It is an arithmetic number, because the mean of its divisors is an integer number (2121565605211).

Almost surely, 2^{4243131210421} is an apocalyptic number.

It is an amenable number.

4243131210421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243131210421 is an equidigital number, since it uses as much as digits as its factorization.

4243131210421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 4243131210421 its reverse (1240121313424), we get a palindrome (5483252523845).

The spelling of 4243131210421 in words is "four trillion, two hundred forty-three billion, one hundred thirty-one million, two hundred ten thousand, four hundred twenty-one".