43708403821 has 2 divisors, whose sum is σ = 43708403822. Its totient is φ = 43708403820.

The previous prime is 43708403819. The next prime is 43708403861. The reversal of 43708403821 is 12830480734.

It is an a-pointer prime, because the next prime (43708403861) can be obtained adding 43708403821 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26736828196 + 16971575625 = 163514^2 + 130275^2 .

It is a cyclic number.

It is not a de Polignac number, because 43708403821 - 2¹ = 43708403819 is a prime.

Together with 43708403819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43708403861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21854201910 + 21854201911.

It is an arithmetic number, because the mean of its divisors is an integer number (21854201911).

Almost surely, 2^43708403821 is an apocalyptic number.

It is an amenable number.

43708403821 is a deficient number, since it is larger than the sum of its proper divisors (1).

43708403821 is an equidigital number, since it uses as much as digits as its factorization.

43708403821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 43708403821 in words is "forty-three billion, seven hundred eight million, four hundred three thousand, eight hundred twenty-one".