43266815036821 has 2 divisors, whose sum is σ = 43266815036822. Its totient is φ = 43266815036820.

The previous prime is 43266815036803. The next prime is 43266815036839. The reversal of 43266815036821 is 12863051866234.

43266815036821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (43266815036803) and next prime (43266815036839).

It can be written as a sum of positive squares in only one way, i.e., 29558642009796 + 13708173027025 = 5436786^2 + 3702455^2 .

It is a cyclic number.

It is not a de Polignac number, because 43266815036821 - 2⁷ = 43266815036693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43266815036891) 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, 21633407518410 + 21633407518411.

It is an arithmetic number, because the mean of its divisors is an integer number (21633407518411).

Almost surely, 2^{43266815036821} is an apocalyptic number.

It is an amenable number.

43266815036821 is a deficient number, since it is larger than the sum of its proper divisors (1).

43266815036821 is an equidigital number, since it uses as much as digits as its factorization.

43266815036821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9953280, while the sum is 55.

The spelling of 43266815036821 in words is "forty-three trillion, two hundred sixty-six billion, eight hundred fifteen million, thirty-six thousand, eight hundred twenty-one".