71021019997 has 2 divisors, whose sum is σ = 71021019998. Its totient is φ = 71021019996.

The previous prime is 71021019973. The next prime is 71021020013. The reversal of 71021019997 is 79991012017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68775587001 + 2245432996 = 262251^2 + 47386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71021019997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71021019947) 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, 35510509998 + 35510509999.

It is an arithmetic number, because the mean of its divisors is an integer number (35510509999).

Almost surely, 2^71021019997 is an apocalyptic number.

It is an amenable number.

71021019997 is a deficient number, since it is larger than the sum of its proper divisors (1).

71021019997 is an equidigital number, since it uses as much as digits as its factorization.

71021019997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71442, while the sum is 46.

The spelling of 71021019997 in words is "seventy-one billion, twenty-one million, nineteen thousand, nine hundred ninety-seven".