43021243636243 has 2 divisors, whose sum is σ = 43021243636244. Its totient is φ = 43021243636242.

The previous prime is 43021243636121. The next prime is 43021243636309. The reversal of 43021243636243 is 34263634212034.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43021243636243 - 2⁹ = 43021243635731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43021243636243.

It is not a weakly prime, because it can be changed into another prime (43021243630243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21510621818121 + 21510621818122.

It is an arithmetic number, because the mean of its divisors is an integer number (21510621818122).

Almost surely, 2^{43021243636243} is an apocalyptic number.

43021243636243 is a deficient number, since it is larger than the sum of its proper divisors (1).

43021243636243 is an equidigital number, since it uses as much as digits as its factorization.

43021243636243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 43.

Adding to 43021243636243 its reverse (34263634212034), we get a palindrome (77284877848277).

The spelling of 43021243636243 in words is "forty-three trillion, twenty-one billion, two hundred forty-three million, six hundred thirty-six thousand, two hundred forty-three".