43021020073 has 2 divisors, whose sum is σ = 43021020074. Its totient is φ = 43021020072.

The previous prime is 43021020067. The next prime is 43021020083. The reversal of 43021020073 is 37002012034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28794017344 + 14227002729 = 169688^2 + 119277^2 .

It is a cyclic number.

It is not a de Polignac number, because 43021020073 - 2¹⁷ = 43020889001 is a prime.

It is not a weakly prime, because it can be changed into another prime (43021020083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21510510036 + 21510510037.

It is an arithmetic number, because the mean of its divisors is an integer number (21510510037).

Almost surely, 2^43021020073 is an apocalyptic number.

It is an amenable number.

43021020073 is a deficient number, since it is larger than the sum of its proper divisors (1).

43021020073 is an equidigital number, since it uses as much as digits as its factorization.

43021020073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 22.

The spelling of 43021020073 in words is "forty-three billion, twenty-one million, twenty thousand, seventy-three".