43920821899 has 2 divisors, whose sum is σ = 43920821900. Its totient is φ = 43920821898.

The previous prime is 43920821887. The next prime is 43920821911. The reversal of 43920821899 is 99812802934.

43920821899 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 (43920821887) and next prime (43920821911).

It is a cyclic number.

It is not a de Polignac number, because 43920821899 - 2²¹ = 43918724747 is a prime.

It is not a weakly prime, because it can be changed into another prime (43920821839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21960410949 + 21960410950.

It is an arithmetic number, because the mean of its divisors is an integer number (21960410950).

Almost surely, 2^43920821899 is an apocalyptic number.

43920821899 is a deficient number, since it is larger than the sum of its proper divisors (1).

43920821899 is an equidigital number, since it uses as much as digits as its factorization.

43920821899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 43920821899 in words is "forty-three billion, nine hundred twenty million, eight hundred twenty-one thousand, eight hundred ninety-nine".