71222221 has 8 divisors (see below), whose sum is σ = 84022784. Its totient is φ = 59078160.

The previous prime is 71222189. The next prime is 71222227. The reversal of 71222221 is 12222217.

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 71222221 - 2⁵ = 71222189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71222227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163890 + ... + 164323.

It is an arithmetic number, because the mean of its divisors is an integer number (10502848).

Almost surely, 2^71222221 is an apocalyptic number.

It is an amenable number.

71222221 is a deficient number, since it is larger than the sum of its proper divisors (12800563).

71222221 is a wasteful number, since it uses less digits than its factorization.

71222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328251.

The product of its digits is 224, while the sum is 19.

The square root of 71222221 is about 8439.3258617025. The cubic root of 71222221 is about 414.5133328366.

Adding to 71222221 its reverse (12222217), we get a palindrome (83444438).

The spelling of 71222221 in words is "seventy-one million, two hundred twenty-two thousand, two hundred twenty-one".