243221142457 has 2 divisors, whose sum is σ = 243221142458. Its totient is φ = 243221142456.

The previous prime is 243221142443. The next prime is 243221142499. The reversal of 243221142457 is 754241122342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178898545296 + 64322597161 = 422964^2 + 253619^2 .

It is a cyclic number.

It is not a de Polignac number, because 243221142457 - 2¹⁹ = 243220618169 is a prime.

It is not a weakly prime, because it can be changed into another prime (243221142557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121610571228 + 121610571229.

It is an arithmetic number, because the mean of its divisors is an integer number (121610571229).

Almost surely, 2^243221142457 is an apocalyptic number.

It is an amenable number.

243221142457 is a deficient number, since it is larger than the sum of its proper divisors (1).

243221142457 is an equidigital number, since it uses as much as digits as its factorization.

243221142457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 37.

Adding to 243221142457 its reverse (754241122342), we get a palindrome (997462264799).

The spelling of 243221142457 in words is "two hundred forty-three billion, two hundred twenty-one million, one hundred forty-two thousand, four hundred fifty-seven".