71040162421 has 4 divisors (see below), whose sum is σ = 71450799372. Its totient is φ = 70629525472.

The previous prime is 71040162383. The next prime is 71040162463. The reversal of 71040162421 is 12426104017.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66881718225 + 4158444196 = 258615^2 + 64486^2 .

It is a cyclic number.

It is not a de Polignac number, because 71040162421 - 2⁷ = 71040162293 is a prime.

It is a super-3 number, since 3×71040162421³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71040162421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71040162481) 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 in 3 ways as a sum of consecutive naturals, for example, 205318216 + ... + 205318561.

It is an arithmetic number, because the mean of its divisors is an integer number (17862699843).

Almost surely, 2^71040162421 is an apocalyptic number.

It is an amenable number.

71040162421 is a deficient number, since it is larger than the sum of its proper divisors (410636951).

71040162421 is a wasteful number, since it uses less digits than its factorization.

71040162421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410636950.

The product of its (nonzero) digits is 2688, while the sum is 28.

Adding to 71040162421 its reverse (12426104017), we get a palindrome (83466266438).

The spelling of 71040162421 in words is "seventy-one billion, forty million, one hundred sixty-two thousand, four hundred twenty-one".