71331342421 has 8 divisors (see below), whose sum is σ = 72836293464. Its totient is φ = 69840656640.

The previous prime is 71331342391. The next prime is 71331342431. The reversal of 71331342421 is 12424313317.

It can be written as a sum of positive squares in 4 ways, for example, as 30246079396 + 41085263025 = 173914^2 + 202695^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71331342421 - 2¹⁵ = 71331309653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71331342431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3556210 + ... + 3576211.

It is an arithmetic number, because the mean of its divisors is an integer number (9104536683).

Almost surely, 2^71331342421 is an apocalyptic number.

It is an amenable number.

71331342421 is a deficient number, since it is larger than the sum of its proper divisors (1504951043).

71331342421 is a wasteful number, since it uses less digits than its factorization.

71331342421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7132631.

The product of its digits is 12096, while the sum is 31.

Adding to 71331342421 its reverse (12424313317), we get a palindrome (83755655738).

The spelling of 71331342421 in words is "seventy-one billion, three hundred thirty-one million, three hundred forty-two thousand, four hundred twenty-one".