71005221 has 32 divisors (see below), whose sum is σ = 124108800. Its totient is φ = 39262320.

The previous prime is 71005219. The next prime is 71005229. The reversal of 71005221 is 12250017.

It is not a de Polignac number, because 71005221 - 2¹ = 71005219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 71005194 and 71005203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71005229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201 + ... + 11918.

It is an arithmetic number, because the mean of its divisors is an integer number (3878400).

Almost surely, 2^71005221 is an apocalyptic number.

It is an amenable number.

71005221 is a deficient number, since it is larger than the sum of its proper divisors (53103579).

71005221 is a wasteful number, since it uses less digits than its factorization.

71005221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12166 (or 12160 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 71005221 is about 8426.4595768330. The cubic root of 71005221 is about 414.0919245571.

Adding to 71005221 its reverse (12250017), we get a palindrome (83255238).

It can be divided in two parts, 7100 and 5221, that added together give a palindrome (12321).

The spelling of 71005221 in words is "seventy-one million, five thousand, two hundred twenty-one".