71415221 has 4 divisors (see below), whose sum is σ = 72762732. Its totient is φ = 70067712.

The previous prime is 71415191. The next prime is 71415229. The reversal of 71415221 is 12251417.

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 26122321 + 45292900 = 5111^2 + 6730^2 .

It is a cyclic number.

It is not a de Polignac number, because 71415221 - 2¹⁴ = 71398837 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 (71415229) 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, 673676 + ... + 673781.

It is an arithmetic number, because the mean of its divisors is an integer number (18190683).

Almost surely, 2^71415221 is an apocalyptic number.

It is an amenable number.

71415221 is a deficient number, since it is larger than the sum of its proper divisors (1347511).

71415221 is a wasteful number, since it uses less digits than its factorization.

71415221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347510.

The product of its digits is 560, while the sum is 23.

The square root of 71415221 is about 8450.7526883704. The cubic root of 71415221 is about 414.8874151461.

Adding to 71415221 its reverse (12251417), we get a palindrome (83666638).

The spelling of 71415221 in words is "seventy-one million, four hundred fifteen thousand, two hundred twenty-one".