It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-52721 is a prime.
It is a Chen prime.
It is an alternating number because its digits alternate between odd and even.
It is a plaindrome in base 11.
It is a self number, because there is not a number n which added to its sum of digits gives 52721.
252721 is an apocalyptic number.
It is an amenable number.
52721 is an equidigital number, since it uses as much as digits as its factorization.
52721 is an evil number, because the sum of its binary digits is even.
The square root of 52721 is about 229.6105398278. The cubic root of 52721 is about 37.4968293616.
The spelling of 52721 in words is "fifty-two thousand, seven hundred twenty-one".