71143318321 has 2 divisors, whose sum is σ = 71143318322. Its totient is φ = 71143318320.

The previous prime is 71143318313. The next prime is 71143318349. The reversal of 71143318321 is 12381334117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70139695921 + 1003622400 = 264839^2 + 31680^2 .

It is a cyclic number.

It is not a de Polignac number, because 71143318321 - 2³ = 71143318313 is a prime.

It is a super-2 number, since 2×71143318321² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71143318381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35571659160 + 35571659161.

It is an arithmetic number, because the mean of its divisors is an integer number (35571659161).

Almost surely, 2^71143318321 is an apocalyptic number.

It is an amenable number.

71143318321 is a deficient number, since it is larger than the sum of its proper divisors (1).

71143318321 is an equidigital number, since it uses as much as digits as its factorization.

71143318321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The spelling of 71143318321 in words is "seventy-one billion, one hundred forty-three million, three hundred eighteen thousand, three hundred twenty-one".