71246845921 has 2 divisors, whose sum is σ = 71246845922. Its totient is φ = 71246845920.

The previous prime is 71246845877. The next prime is 71246845927. The reversal of 71246845921 is 12954864217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64475366400 + 6771479521 = 253920^2 + 82289^2 .

It is a cyclic number.

It is not a de Polignac number, because 71246845921 - 2¹¹ = 71246843873 is a prime.

It is a super-2 number, since 2×71246845921² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71246845927) 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, 35623422960 + 35623422961.

It is an arithmetic number, because the mean of its divisors is an integer number (35623422961).

Almost surely, 2^71246845921 is an apocalyptic number.

It is an amenable number.

71246845921 is a deficient number, since it is larger than the sum of its proper divisors (1).

71246845921 is an equidigital number, since it uses as much as digits as its factorization.

71246845921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 49.

The spelling of 71246845921 in words is "seventy-one billion, two hundred forty-six million, eight hundred forty-five thousand, nine hundred twenty-one".