71310210221 has 4 divisors (see below), whose sum is σ = 75063379200. Its totient is φ = 67557041244.

The previous prime is 71310210211. The next prime is 71310210239. The reversal of 71310210221 is 12201201317.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12201201317 = 56503 ⋅215939.

It is a cyclic number.

It is not a de Polignac number, because 71310210221 - 2⁶ = 71310210157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 71310210193 and 71310210202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71310210211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1876584461 + ... + 1876584498.

It is an arithmetic number, because the mean of its divisors is an integer number (18765844800).

Almost surely, 2^71310210221 is an apocalyptic number.

It is an amenable number.

71310210221 is a deficient number, since it is larger than the sum of its proper divisors (3753168979).

71310210221 is a wasteful number, since it uses less digits than its factorization.

71310210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753168978.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 71310210221 its reverse (12201201317), we get a palindrome (83511411538).

The spelling of 71310210221 in words is "seventy-one billion, three hundred ten million, two hundred ten thousand, two hundred twenty-one".