71212223 has 4 divisors (see below), whose sum is σ = 72275160. Its totient is φ = 70149288.

The previous prime is 71212213. The next prime is 71212237. The reversal of 71212223 is 32221217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32221217 = 7 ⋅4603031.

It is a cyclic number.

It is not a de Polignac number, because 71212223 - 2⁶ = 71212159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71212195 and 71212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71212213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531368 + ... + 531501.

It is an arithmetic number, because the mean of its divisors is an integer number (18068790).

Almost surely, 2^71212223 is an apocalyptic number.

71212223 is a deficient number, since it is larger than the sum of its proper divisors (1062937).

71212223 is a wasteful number, since it uses less digits than its factorization.

71212223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062936.

The product of its digits is 336, while the sum is 20.

The square root of 71212223 is about 8438.7334950216. The cubic root of 71212223 is about 414.4939358086.

The spelling of 71212223 in words is "seventy-one million, two hundred twelve thousand, two hundred twenty-three".