43021271005781 has 2 divisors, whose sum is σ = 43021271005782. Its totient is φ = 43021271005780.

The previous prime is 43021271005759. The next prime is 43021271005787. The reversal of 43021271005781 is 18750017212034.

43021271005781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22001109205156 + 21020161800625 = 4690534^2 + 4584775^2 .

It is a cyclic number.

It is not a de Polignac number, because 43021271005781 - 2¹⁴ = 43021270989397 is a prime.

It is a super-2 number, since 2×43021271005781² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43021271005787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21510635502890 + 21510635502891.

It is an arithmetic number, because the mean of its divisors is an integer number (21510635502891).

Almost surely, 2^{43021271005781} is an apocalyptic number.

It is an amenable number.

43021271005781 is a deficient number, since it is larger than the sum of its proper divisors (1).

43021271005781 is an equidigital number, since it uses as much as digits as its factorization.

43021271005781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 41.

The spelling of 43021271005781 in words is "forty-three trillion, twenty-one billion, two hundred seventy-one million, five thousand, seven hundred eighty-one".