43318294021 has 2 divisors, whose sum is σ = 43318294022. Its totient is φ = 43318294020.

The previous prime is 43318293989. The next prime is 43318294039. The reversal of 43318294021 is 12049281334.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22049280100 + 21269013921 = 148490^2 + 145839^2 .

It is a cyclic number.

It is not a de Polignac number, because 43318294021 - 2⁵ = 43318293989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43318294321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21659147010 + 21659147011.

It is an arithmetic number, because the mean of its divisors is an integer number (21659147011).

Almost surely, 2^43318294021 is an apocalyptic number.

It is an amenable number.

43318294021 is a deficient number, since it is larger than the sum of its proper divisors (1).

43318294021 is an equidigital number, since it uses as much as digits as its factorization.

43318294021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 43318294021 in words is "forty-three billion, three hundred eighteen million, two hundred ninety-four thousand, twenty-one".