71662271221 has 8 divisors (see below), whose sum is σ = 73635661440. Its totient is φ = 69702827712.

The previous prime is 71662271207. The next prime is 71662271231. The reversal of 71662271221 is 12217226617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71662271221 - 2⁹ = 71662270709 is a prime.

It is a super-2 number, since 2×71662271221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71662271231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3476260 + ... + 3496813.

It is an arithmetic number, because the mean of its divisors is an integer number (9204457680).

Almost surely, 2^71662271221 is an apocalyptic number.

It is an amenable number.

71662271221 is a deficient number, since it is larger than the sum of its proper divisors (1973390219).

71662271221 is a wasteful number, since it uses less digits than its factorization.

71662271221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6973355.

The product of its digits is 28224, while the sum is 37.

Adding to 71662271221 its reverse (12217226617), we get a palindrome (83879497838).

The spelling of 71662271221 in words is "seventy-one billion, six hundred sixty-two million, two hundred seventy-one thousand, two hundred twenty-one".