4721 has 2 divisors, whose sum is σ = 4722.
Its totient is φ = 4720.
The previous prime is 4703. The next prime is 4723. The reversal of 4721 is 1274.
Added to its reverse (1274) it gives a triangular number (5995 = T109).
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 4096 + 625 = 64^2 + 25^2
It is a cyclic number.
It is not a de Polignac number, because 4721 - 26 = 4657 is a prime.
Together with 4723, it forms a pair of twin primes.
It is a Chen prime.
It is an alternating number because its digits alternate between even and odd.
It is a junction number, because it is equal to n+sod(n) for n = 4696 and 4705.
It is not a weakly prime, because it can be changed into another prime (4723) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2360 + 2361.
It is an arithmetic number, because the mean of its divisors is an integer number (2361).
It is an amenable number.
4721 is a deficient number, since it is larger than the sum of its proper divisors (1).
4721 is an equidigital number, since it uses as much as digits as its factorization.
4721 is an evil number, because the sum of its binary digits is even.
The product of its digits is 56, while the sum is 14.
The square root of 4721 is about 68.7095335452.
The cubic root of 4721 is about 16.7755976031.
Adding to 4721 its reverse (1274), we get a palindrome (5995).
The spelling of 4721 in words is "four thousand, seven hundred twenty-one", and thus it is an iban number.