71306006021 has 2 divisors, whose sum is σ = 71306006022. Its totient is φ = 71306006020.

The previous prime is 71306005999. The next prime is 71306006047. The reversal of 71306006021 is 12060060317.

It is an a-pointer prime, because the next prime (71306006047) can be obtained adding 71306006021 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63378062500 + 7927943521 = 251750^2 + 89039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71306006021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71306006221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35653003010 + 35653003011.

It is an arithmetic number, because the mean of its divisors is an integer number (35653003011).

Almost surely, 2^71306006021 is an apocalyptic number.

It is an amenable number.

71306006021 is a deficient number, since it is larger than the sum of its proper divisors (1).

71306006021 is an equidigital number, since it uses as much as digits as its factorization.

71306006021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

Adding to 71306006021 its reverse (12060060317), we get a palindrome (83366066338).

The spelling of 71306006021 in words is "seventy-one billion, three hundred six million, six thousand, twenty-one".