41721 has 4 divisors (see below), whose sum is σ = 55632. Its totient is φ = 27812.

The previous prime is 41719. The next prime is 41729. The reversal of 41721 is 12714.

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 a cyclic number.

It is not a de Polignac number, because 41721 - 2¹ = 41719 is a prime.

It is a D-number.

It is a Curzon number.

41721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 41721.

It is not an unprimeable number, because it can be changed into a prime (41729) 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, 6951 + ... + 6956.

It is an arithmetic number, because the mean of its divisors is an integer number (13908).

2⁴¹⁷²¹ is an apocalyptic number.

It is an amenable number.

41721 is a deficient number, since it is larger than the sum of its proper divisors (13911).

41721 is a wasteful number, since it uses less digits than its factorization.

41721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13910.

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

The square root of 41721 is about 204.2571908159. The cubic root of 41721 is about 34.6831262240.

The spelling of 41721 in words is "forty-one thousand, seven hundred twenty-one", and thus it is an iban number.