10210721 has 2 divisors, whose sum is σ = 10210722. Its totient is φ = 10210720.

The previous prime is 10210691. The next prime is 10210769. The reversal of 10210721 is 12701201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5125696 + 5085025 = 2264^2 + 2255^2 .

It is a cyclic number.

It is not a de Polignac number, because 10210721 - 2¹⁴ = 10194337 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 10210696 and 10210705.

It is not a weakly prime, because it can be changed into another prime (10210121) 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, 5105360 + 5105361.

It is an arithmetic number, because the mean of its divisors is an integer number (5105361).

Almost surely, 2^10210721 is an apocalyptic number.

It is an amenable number.

10210721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10210721 is an equidigital number, since it uses as much as digits as its factorization.

10210721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 10210721 is about 3195.4218813797. The cubic root of 10210721 is about 216.9462444802.

Adding to 10210721 its reverse (12701201), we get a palindrome (22911922).

The spelling of 10210721 in words is "ten million, two hundred ten thousand, seven hundred twenty-one".