43035173021 has 2 divisors, whose sum is σ = 43035173022. Its totient is φ = 43035173020.

The previous prime is 43035172993. The next prime is 43035173029. The reversal of 43035173021 is 12037153034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27552348121 + 15482824900 = 165989^2 + 124430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43035173021 is a prime.

It is a super-2 number, since 2×43035173021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43035173029) 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, 21517586510 + 21517586511.

It is an arithmetic number, because the mean of its divisors is an integer number (21517586511).

Almost surely, 2^43035173021 is an apocalyptic number.

It is an amenable number.

43035173021 is a deficient number, since it is larger than the sum of its proper divisors (1).

43035173021 is an equidigital number, since it uses as much as digits as its factorization.

43035173021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 29.

The spelling of 43035173021 in words is "forty-three billion, thirty-five million, one hundred seventy-three thousand, twenty-one".