71012221 has 12 divisors (see below), whose sum is σ = 84529632. Its totient is φ = 59450328.

The previous prime is 71012219. The next prime is 71012233. The reversal of 71012221 is 12221017.

It is not a de Polignac number, because 71012221 - 2¹ = 71012219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71012195 and 71012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71010221) 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 11 ways as a sum of consecutive naturals, for example, 14745 + ... + 18958.

It is an arithmetic number, because the mean of its divisors is an integer number (7044136).

Almost surely, 2^71012221 is an apocalyptic number.

It is an amenable number.

71012221 is a deficient number, since it is larger than the sum of its proper divisors (13517411).

71012221 is a wasteful number, since it uses less digits than its factorization.

71012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33760 (or 33753 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 71012221 is about 8426.8749249054. The cubic root of 71012221 is about 414.1055317641.

Adding to 71012221 its reverse (12221017), we get a palindrome (83233238).

The spelling of 71012221 in words is "seventy-one million, twelve thousand, two hundred twenty-one".