71401321 has 4 divisors (see below), whose sum is σ = 71421012. Its totient is φ = 71381632.

The previous prime is 71401313. The next prime is 71401403. The reversal of 71401321 is 12310417.

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 64320400 + 7080921 = 8020^2 + 2661^2 .

It is a cyclic number.

It is not a de Polignac number, because 71401321 - 2³ = 71401313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71407321) 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, 2656 + ... + 12241.

It is an arithmetic number, because the mean of its divisors is an integer number (17855253).

Almost surely, 2^71401321 is an apocalyptic number.

It is an amenable number.

71401321 is a deficient number, since it is larger than the sum of its proper divisors (19691).

71401321 is a wasteful number, since it uses less digits than its factorization.

71401321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19690.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 71401321 is about 8449.9302363984. The cubic root of 71401321 is about 414.8604960049.

Adding to 71401321 its reverse (12310417), we get a palindrome (83711738).

The spelling of 71401321 in words is "seventy-one million, four hundred one thousand, three hundred twenty-one".