43111343644321 has 2 divisors, whose sum is σ = 43111343644322. Its totient is φ = 43111343644320.

The previous prime is 43111343644319. The next prime is 43111343644349. The reversal of 43111343644321 is 12344634311134.

43111343644321 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 can be written as a sum of positive squares in only one way, i.e., 26800407501921 + 16310936142400 = 5176911^2 + 4038680^2 .

It is a cyclic number.

It is not a de Polignac number, because 43111343644321 - 2¹ = 43111343644319 is a prime.

Together with 43111343644319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43111343644351) 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, 21555671822160 + 21555671822161.

It is an arithmetic number, because the mean of its divisors is an integer number (21555671822161).

Almost surely, 2^{43111343644321} is an apocalyptic number.

It is an amenable number.

43111343644321 is a deficient number, since it is larger than the sum of its proper divisors (1).

43111343644321 is an equidigital number, since it uses as much as digits as its factorization.

43111343644321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 40.

Adding to 43111343644321 its reverse (12344634311134), we get a palindrome (55455977955455).

The spelling of 43111343644321 in words is "forty-three trillion, one hundred eleven billion, three hundred forty-three million, six hundred forty-four thousand, three hundred twenty-one".