52721 has 2 divisors, whose sum is σ = 52722. Its totient is φ = 52720.

The previous prime is 52711. The next prime is 52727. The reversal of 52721 is 12725.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34225 + 18496 = 185^2 + 136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-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.

It is not a weakly prime, because it can be changed into another prime (52727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26360 + 26361.

It is an arithmetic number, because the mean of its divisors is an integer number (26361).

2⁵²⁷²¹ is an apocalyptic number.

It is an amenable number.

52721 is a deficient number, since it is larger than the sum of its proper divisors (1).

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 product of its digits is 140, while the sum is 17.

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".