71321 has 4 divisors (see below), whose sum is σ = 72372. Its totient is φ = 70272.

The previous prime is 71317. The next prime is 71327. The reversal of 71321 is 12317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12317 = 109 ⋅113.

It can be written as a sum of positive squares in 2 ways, for example, as 55696 + 15625 = 236^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 71321 - 2² = 71317 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 71296 and 71305.

It is not an unprimeable number, because it can be changed into a prime (71327) 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, 416 + ... + 561.

It is an arithmetic number, because the mean of its divisors is an integer number (18093).

2⁷¹³²¹ is an apocalyptic number.

It is an amenable number.

71321 is a deficient number, since it is larger than the sum of its proper divisors (1051).

71321 is an equidigital number, since it uses as much as digits as its factorization.

71321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050.

The product of its digits is 42, while the sum is 14.

The square root of 71321 is about 267.0599183704. The cubic root of 71321 is about 41.4704875576.

Adding to 71321 its reverse (12317), we get a palindrome (83638).

It can be divided in two parts, 71 and 321, that multiplied together give a triangular number (22791 = T₂₁₃).

The spelling of 71321 in words is "seventy-one thousand, three hundred twenty-one", and thus it is an iban number.