10204721 has 2 divisors, whose sum is σ = 10204722. Its totient is φ = 10204720.

The previous prime is 10204693. The next prime is 10204741. The reversal of 10204721 is 12740201.

10204721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8202496 + 2002225 = 2864^2 + 1415^2 .

It is an emirp because it is prime and its reverse (12740201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10204721 - 2¹⁸ = 9942577 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10204721.

It is not a weakly prime, because it can be changed into another prime (10204741) 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, 5102360 + 5102361.

It is an arithmetic number, because the mean of its divisors is an integer number (5102361).

Almost surely, 2^10204721 is an apocalyptic number.

It is an amenable number.

10204721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10204721 is an equidigital number, since it uses as much as digits as its factorization.

10204721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 10204721 is about 3194.4829002516. The cubic root of 10204721 is about 216.9037423392.

Adding to 10204721 its reverse (12740201), we get a palindrome (22944922).

The spelling of 10204721 in words is "ten million, two hundred four thousand, seven hundred twenty-one".