71220211 has 4 divisors (see below), whose sum is σ = 71253000. Its totient is φ = 71187424.

The previous prime is 71220209. The next prime is 71220217. The reversal of 71220211 is 11202217.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71220211 - 2¹ = 71220209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71220217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12886 + ... + 17563.

It is an arithmetic number, because the mean of its divisors is an integer number (17813250).

Almost surely, 2^71220211 is an apocalyptic number.

71220211 is a deficient number, since it is larger than the sum of its proper divisors (32789).

71220211 is a wasteful number, since it uses less digits than its factorization.

71220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32788.

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

The square root of 71220211 is about 8439.2067755210. The cubic root of 71220211 is about 414.5094333998.

Adding to 71220211 its reverse (11202217), we get a palindrome (82422428).

The spelling of 71220211 in words is "seventy-one million, two hundred twenty thousand, two hundred eleven".