10030721 has 2 divisors, whose sum is σ = 10030722. Its totient is φ = 10030720.

The previous prime is 10030717. The next prime is 10030751. The reversal of 10030721 is 12703001.

10030721 = 2239² + 2240².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5017600 + 5013121 = 2240^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 10030721 - 2² = 10030717 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 10030696 and 10030705.

It is not a weakly prime, because it can be changed into another prime (10030751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5015360 + 5015361.

It is an arithmetic number, because the mean of its divisors is an integer number (5015361).

Almost surely, 2^10030721 is an apocalyptic number.

10030721 is the 2240-th centered square number.

It is an amenable number.

10030721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10030721 is an equidigital number, since it uses as much as digits as its factorization.

10030721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 10030721 is about 3167.1313518703. The cubic root of 10030721 is about 215.6638647581.

Adding to 10030721 its reverse (12703001), we get a palindrome (22733722).

The spelling of 10030721 in words is "ten million, thirty thousand, seven hundred twenty-one".