10015721 has 2 divisors, whose sum is σ = 10015722. Its totient is φ = 10015720.

The previous prime is 10015711. The next prime is 10015727. The reversal of 10015721 is 12751001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8934121 + 1081600 = 2989^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 10015721 - 2⁶ = 10015657 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 10015721.

It is not a weakly prime, because it can be changed into another prime (10015727) 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, 5007860 + 5007861.

It is an arithmetic number, because the mean of its divisors is an integer number (5007861).

Almost surely, 2^10015721 is an apocalyptic number.

It is an amenable number.

10015721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10015721 is an equidigital number, since it uses as much as digits as its factorization.

10015721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 10015721 is about 3164.7623923448. The cubic root of 10015721 is about 215.5563094509.

Adding to 10015721 its reverse (12751001), we get a palindrome (22766722).

The spelling of 10015721 in words is "ten million, fifteen thousand, seven hundred twenty-one".