10200000721 has 2 divisors, whose sum is σ = 10200000722. Its totient is φ = 10200000720.

The previous prime is 10200000689. The next prime is 10200000737. The reversal of 10200000721 is 12700000201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10181819025 + 18181696 = 100905^2 + 4264^2 .

It is a cyclic number.

It is not a de Polignac number, because 10200000721 - 2⁵ = 10200000689 is a prime.

It is not a weakly prime, because it can be changed into another prime (10200000761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100000360 + 5100000361.

It is an arithmetic number, because the mean of its divisors is an integer number (5100000361).

Almost surely, 2^10200000721 is an apocalyptic number.

It is an amenable number.

10200000721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10200000721 is an equidigital number, since it uses as much as digits as its factorization.

10200000721 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 13.

Adding to 10200000721 its reverse (12700000201), we get a palindrome (22900000922).

The spelling of 10200000721 in words is "ten billion, two hundred million, seven hundred twenty-one", and thus it is an aban number.