43043703712721 has 2 divisors, whose sum is σ = 43043703712722. Its totient is φ = 43043703712720.

The previous prime is 43043703712619. The next prime is 43043703712843. The reversal of 43043703712721 is 12721730734034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39279851508496 + 3763852204225 = 6267364^2 + 1940065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43043703712721 is a prime.

It is not a weakly prime, because it can be changed into another prime (43043703702721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21521851856360 + 21521851856361.

It is an arithmetic number, because the mean of its divisors is an integer number (21521851856361).

Almost surely, 2^{43043703712721} is an apocalyptic number.

It is an amenable number.

43043703712721 is a deficient number, since it is larger than the sum of its proper divisors (1).

43043703712721 is an equidigital number, since it uses as much as digits as its factorization.

43043703712721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 44.

The spelling of 43043703712721 in words is "forty-three trillion, forty-three billion, seven hundred three million, seven hundred twelve thousand, seven hundred twenty-one".