40208018321 has 2 divisors, whose sum is σ = 40208018322. Its totient is φ = 40208018320.

The previous prime is 40208018269. The next prime is 40208018327. The reversal of 40208018321 is 12381080204.

40208018321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31164959296 + 9043059025 = 176536^2 + 95095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40208018321 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40208018327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20104009160 + 20104009161.

It is an arithmetic number, because the mean of its divisors is an integer number (20104009161).

Almost surely, 2^40208018321 is an apocalyptic number.

It is an amenable number.

40208018321 is a deficient number, since it is larger than the sum of its proper divisors (1).

40208018321 is an equidigital number, since it uses as much as digits as its factorization.

40208018321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 29.

Adding to 40208018321 its reverse (12381080204), we get a palindrome (52589098525).

It can be divided in two parts, 402080183 and 21, that added together give a palindrome (402080204).

The spelling of 40208018321 in words is "forty billion, two hundred eight million, eighteen thousand, three hundred twenty-one".