71340221 has 4 divisors (see below), whose sum is σ = 71853600. Its totient is φ = 70826844.

The previous prime is 71340209. The next prime is 71340233. The reversal of 71340221 is 12204317.

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 an interprime number because it is at equal distance from previous prime (71340209) and next prime (71340233).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71340221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71340193 and 71340202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71340251) 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, 256481 + ... + 256758.

It is an arithmetic number, because the mean of its divisors is an integer number (17963400).

Almost surely, 2^71340221 is an apocalyptic number.

It is an amenable number.

71340221 is a deficient number, since it is larger than the sum of its proper divisors (513379).

71340221 is a wasteful number, since it uses less digits than its factorization.

71340221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513378.

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

The square root of 71340221 is about 8446.3140481514. The cubic root of 71340221 is about 414.7421265326.

Adding to 71340221 its reverse (12204317), we get a palindrome (83544538).

The spelling of 71340221 in words is "seventy-one million, three hundred forty thousand, two hundred twenty-one".