43021020017 has 2 divisors, whose sum is σ = 43021020018. Its totient is φ = 43021020016.

The previous prime is 43021019969. The next prime is 43021020067. The reversal of 43021020017 is 71002012034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41834975296 + 1186044721 = 204536^2 + 34439^2 .

It is a cyclic number.

It is not a de Polignac number, because 43021020017 - 2²⁶ = 42953911153 is a prime.

It is a super-2 number, since 2×43021020017² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43021020067) 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, 21510510008 + 21510510009.

It is an arithmetic number, because the mean of its divisors is an integer number (21510510009).

Almost surely, 2^43021020017 is an apocalyptic number.

It is an amenable number.

43021020017 is a deficient number, since it is larger than the sum of its proper divisors (1).

43021020017 is an equidigital number, since it uses as much as digits as its factorization.

43021020017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The spelling of 43021020017 in words is "forty-three billion, twenty-one million, twenty thousand, seventeen".