71214221 has 8 divisors (see below), whose sum is σ = 76818840. Its totient is φ = 65627712.

The previous prime is 71214203. The next prime is 71214271. The reversal of 71214221 is 12241217.

It can be written as a sum of positive squares in 4 ways, for example, as 4791721 + 66422500 = 2189^2 + 8150^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71214221 - 2²² = 67019917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71214193 and 71214202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71214271) 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 7 ways as a sum of consecutive naturals, for example, 4295 + ... + 12683.

It is an arithmetic number, because the mean of its divisors is an integer number (9602355).

Almost surely, 2^71214221 is an apocalyptic number.

It is an amenable number.

71214221 is a deficient number, since it is larger than the sum of its proper divisors (5604619).

71214221 is a wasteful number, since it uses less digits than its factorization.

71214221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9055.

The product of its digits is 224, while the sum is 20.

The square root of 71214221 is about 8438.8518768847. The cubic root of 71214221 is about 414.4978122552.

Adding to 71214221 its reverse (12241217), we get a palindrome (83455438).

The spelling of 71214221 in words is "seventy-one million, two hundred fourteen thousand, two hundred twenty-one".