71221121101 has 4 divisors (see below), whose sum is σ = 76699668892. Its totient is φ = 65742573312.

The previous prime is 71221121099. The next prime is 71221121123. The reversal of 71221121101 is 10112112217.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4630802500 + 66590318601 = 68050^2 + 258051^2 .

It is not a de Polignac number, because 71221121101 - 2¹ = 71221121099 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 (71221121131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2739273876 + ... + 2739273901.

It is an arithmetic number, because the mean of its divisors is an integer number (19174917223).

Almost surely, 2^71221121101 is an apocalyptic number.

It is an amenable number.

71221121101 is a deficient number, since it is larger than the sum of its proper divisors (5478547791).

71221121101 is a wasteful number, since it uses less digits than its factorization.

71221121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5478547790.

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

Adding to 71221121101 its reverse (10112112217), we get a palindrome (81333233318).

The spelling of 71221121101 in words is "seventy-one billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred one".