71421 has 16 divisors (see below), whose sum is σ = 115200. Its totient is φ = 38448.

The previous prime is 71419. The next prime is 71429. The reversal of 71421 is 12417.

It is not a de Polignac number, because 71421 - 2¹ = 71419 is a prime.

It is an Ulam number.

71421 is a lucky number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 71421.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 71421.

It is not an unprimeable number, because it can be changed into a prime (71429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310 + ... + 488.

It is an arithmetic number, because the mean of its divisors is an integer number (7200).

2⁷¹⁴²¹ is an apocalyptic number.

It is an amenable number.

71421 is a deficient number, since it is larger than the sum of its proper divisors (43779).

71421 is a wasteful number, since it uses less digits than its factorization.

71421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208.

The product of its digits is 56, while the sum is 15.

The square root of 71421 is about 267.2470766912. The cubic root of 71421 is about 41.4898605896.

Adding to 71421 its reverse (12417), we get a palindrome (83838).

The spelling of 71421 in words is "seventy-one thousand, four hundred twenty-one", and thus it is an iban number.