6204721 has 2 divisors, whose sum is σ = 6204722. Its totient is φ = 6204720.

The previous prime is 6204719. The next prime is 6204727. The reversal of 6204721 is 1274026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5588496 + 616225 = 2364^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 6204721 - 2¹ = 6204719 is a prime.

Together with 6204719, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 6204692 and 6204701.

It is not a weakly prime, because it can be changed into another prime (6204727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3102360 + 3102361.

It is an arithmetic number, because the mean of its divisors is an integer number (3102361).

Almost surely, 2^6204721 is an apocalyptic number.

It is an amenable number.

6204721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6204721 is an equidigital number, since it uses as much as digits as its factorization.

6204721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 6204721 is about 2490.9277388154. The cubic root of 6204721 is about 183.7556716901.

Adding to 6204721 its reverse (1274026), we get a palindrome (7478747).

The spelling of 6204721 in words is "six million, two hundred four thousand, seven hundred twenty-one".