71710221 has 16 divisors (see below), whose sum is σ = 104977728. Its totient is φ = 43180800.

The previous prime is 71710217. The next prime is 71710229. The reversal of 71710221 is 12201717.

It is a happy number.

It is not a de Polignac number, because 71710221 - 2² = 71710217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71710229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1740 + ... + 12101.

It is an arithmetic number, because the mean of its divisors is an integer number (6561108).

Almost surely, 2^71710221 is an apocalyptic number.

It is an amenable number.

71710221 is a deficient number, since it is larger than the sum of its proper divisors (33267507).

71710221 is a wasteful number, since it uses less digits than its factorization.

71710221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14012.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 71710221 is about 8468.1887673811. The cubic root of 71710221 is about 415.4578988014.

Adding to 71710221 its reverse (12201717), we get a palindrome (83911938).

The spelling of 71710221 in words is "seventy-one million, seven hundred ten thousand, two hundred twenty-one".