43581421013827 has 2 divisors, whose sum is σ = 43581421013828. Its totient is φ = 43581421013826.

The previous prime is 43581421013807. The next prime is 43581421013917. The reversal of 43581421013827 is 72831012418534.

It is a happy number.

43581421013827 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43581421013827 is a prime.

It is not a weakly prime, because it can be changed into another prime (43581421013807) 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, 21790710506913 + 21790710506914.

It is an arithmetic number, because the mean of its divisors is an integer number (21790710506914).

Almost surely, 2^{43581421013827} is an apocalyptic number.

43581421013827 is a deficient number, since it is larger than the sum of its proper divisors (1).

43581421013827 is an equidigital number, since it uses as much as digits as its factorization.

43581421013827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 43581421013827 in words is "forty-three trillion, five hundred eighty-one billion, four hundred twenty-one million, thirteen thousand, eight hundred twenty-seven".