71015234256421 has 12 divisors (see below), whose sum is σ = 88964139618732. Its totient is φ = 56187877652928.

The previous prime is 71015234256419. The next prime is 71015234256457. The reversal of 71015234256421 is 12465243251017.

It can be written as a sum of positive squares in 2 ways, for example, as 33813224827396 + 37202009429025 = 5814914^2 + 6099345^2 .

It is not a de Polignac number, because 71015234256421 - 2¹ = 71015234256419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71015234259421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55741941480 + ... + 55741942753.

It is an arithmetic number, because the mean of its divisors is an integer number (7413678301561).

Almost surely, 2^{71015234256421} is an apocalyptic number.

It is an amenable number.

71015234256421 is a deficient number, since it is larger than the sum of its proper divisors (17948905362311).

71015234256421 is a wasteful number, since it uses less digits than its factorization.

71015234256421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111483884260 (or 111483884253 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 71015234256421 in words is "seventy-one trillion, fifteen billion, two hundred thirty-four million, two hundred fifty-six thousand, four hundred twenty-one".