71220112111 has 4 divisors (see below), whose sum is σ = 72876393832. Its totient is φ = 69563830392.

The previous prime is 71220112087. The next prime is 71220112133. The reversal of 71220112111 is 11121102217.

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 71220112111 - 2⁷ = 71220111983 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 (71220112151) 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, 828140796 + ... + 828140881.

It is an arithmetic number, because the mean of its divisors is an integer number (18219098458).

Almost surely, 2^71220112111 is an apocalyptic number.

71220112111 is a deficient number, since it is larger than the sum of its proper divisors (1656281721).

71220112111 is a wasteful number, since it uses less digits than its factorization.

71220112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656281720.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 71220112111 its reverse (11121102217), we get a palindrome (82341214328).

The spelling of 71220112111 in words is "seventy-one billion, two hundred twenty million, one hundred twelve thousand, one hundred eleven".