71021 has 8 divisors (see below), whose sum is σ = 76800. Its totient is φ = 65520.

The previous prime is 71011. The next prime is 71023. The reversal of 71021 is 12017.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71021 - 2⁶ = 70957 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 = 70993 and 71011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 860 + ... + 938.

It is an arithmetic number, because the mean of its divisors is an integer number (9600).

2⁷¹⁰²¹ is an apocalyptic number.

It is an amenable number.

71021 is a deficient number, since it is larger than the sum of its proper divisors (5779).

71021 is a wasteful number, since it uses less digits than its factorization.

71021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139.

The product of its (nonzero) digits is 14, while the sum is 11.

The square root of 71021 is about 266.4976547739. The cubic root of 71021 is about 41.4122595882.

Adding to 71021 its reverse (12017), we get a palindrome (83038).

The spelling of 71021 in words is "seventy-one thousand, twenty-one", and thus it is an iban number.