71344394021 has 2 divisors, whose sum is σ = 71344394022. Its totient is φ = 71344394020.

The previous prime is 71344393937. The next prime is 71344394029. The reversal of 71344394021 is 12049344317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57914829025 + 13429564996 = 240655^2 + 115886^2 .

It is an emirp because it is prime and its reverse (12049344317) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71344394021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71344394029) 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, 35672197010 + 35672197011.

It is an arithmetic number, because the mean of its divisors is an integer number (35672197011).

Almost surely, 2^71344394021 is an apocalyptic number.

It is an amenable number.

71344394021 is a deficient number, since it is larger than the sum of its proper divisors (1).

71344394021 is an equidigital number, since it uses as much as digits as its factorization.

71344394021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 71344394021 in words is "seventy-one billion, three hundred forty-four million, three hundred ninety-four thousand, twenty-one".