43488887921 has 2 divisors, whose sum is σ = 43488887922. Its totient is φ = 43488887920.

The previous prime is 43488887917. The next prime is 43488887933. The reversal of 43488887921 is 12978888434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32191536400 + 11297351521 = 179420^2 + 106289^2 .

It is a cyclic number.

It is not a de Polignac number, because 43488887921 - 2² = 43488887917 is a prime.

It is not a weakly prime, because it can be changed into another prime (43488880921) 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, 21744443960 + 21744443961.

It is an arithmetic number, because the mean of its divisors is an integer number (21744443961).

Almost surely, 2^43488887921 is an apocalyptic number.

It is an amenable number.

43488887921 is a deficient number, since it is larger than the sum of its proper divisors (1).

43488887921 is an equidigital number, since it uses as much as digits as its factorization.

43488887921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24772608, while the sum is 62.

The spelling of 43488887921 in words is "forty-three billion, four hundred eighty-eight million, eight hundred eighty-seven thousand, nine hundred twenty-one".