43012011323921 has 2 divisors, whose sum is σ = 43012011323922. Its totient is φ = 43012011323920.

The previous prime is 43012011323893. The next prime is 43012011323923. The reversal of 43012011323921 is 12932311021034.

43012011323921 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., 23871911320321 + 19140100003600 = 4885889^2 + 4374940^2 .

It is a cyclic number.

It is not a de Polignac number, because 43012011323921 - 2²⁶ = 43011944215057 is a prime.

Together with 43012011323923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43012011323923) 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, 21506005661960 + 21506005661961.

It is an arithmetic number, because the mean of its divisors is an integer number (21506005661961).

Almost surely, 2^{43012011323921} is an apocalyptic number.

It is an amenable number.

43012011323921 is a deficient number, since it is larger than the sum of its proper divisors (1).

43012011323921 is an equidigital number, since it uses as much as digits as its factorization.

43012011323921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

Adding to 43012011323921 its reverse (12932311021034), we get a palindrome (55944322344955).

The spelling of 43012011323921 in words is "forty-three trillion, twelve billion, eleven million, three hundred twenty-three thousand, nine hundred twenty-one".