71421812417 has 4 divisors (see below), whose sum is σ = 71586759300. Its totient is φ = 71256865536.

The previous prime is 71421812401. The next prime is 71421812419.

71421812417 is nontrivially palindromic in base 10.

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 44827052176 + 26594760241 = 211724^2 + 163079^2 .

It is a cyclic number.

It is not a de Polignac number, because 71421812417 - 2⁴ = 71421812401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71421812419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82472792 + ... + 82473657.

It is an arithmetic number, because the mean of its divisors is an integer number (17896689825).

Almost surely, 2^71421812417 is an apocalyptic number.

It is an amenable number.

71421812417 is a deficient number, since it is larger than the sum of its proper divisors (164946883).

71421812417 is a wasteful number, since it uses less digits than its factorization.

71421812417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164946882.

The product of its digits is 25088, while the sum is 38.

The spelling of 71421812417 in words is "seventy-one billion, four hundred twenty-one million, eight hundred twelve thousand, four hundred seventeen".