71432221 has 4 divisors (see below), whose sum is σ = 81636832. Its totient is φ = 61227612.

The previous prime is 71432197. The next prime is 71432233. The reversal of 71432221 is 12223417.

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.

It is a cyclic number.

It is not a de Polignac number, because 71432221 - 2⁵ = 71432189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71432192 and 71432201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71432261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5102295 + ... + 5102308.

It is an arithmetic number, because the mean of its divisors is an integer number (20409208).

Almost surely, 2^71432221 is an apocalyptic number.

It is an amenable number.

71432221 is a deficient number, since it is larger than the sum of its proper divisors (10204611).

71432221 is a wasteful number, since it uses less digits than its factorization.

71432221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10204610.

The product of its digits is 672, while the sum is 22.

The square root of 71432221 is about 8451.7584560847. The cubic root of 71432221 is about 414.9203330889.

Adding to 71432221 its reverse (12223417), we get a palindrome (83655638).

The spelling of 71432221 in words is "seventy-one million, four hundred thirty-two thousand, two hundred twenty-one".