11001721 has 2 divisors, whose sum is σ = 11001722. Its totient is φ = 11001720.

The previous prime is 11001719. The next prime is 11001743. The reversal of 11001721 is 12710011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8555625 + 2446096 = 2925^2 + 1564^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001721 - 2¹ = 11001719 is a prime.

Together with 11001719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11001761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5500860 + 5500861.

It is an arithmetic number, because the mean of its divisors is an integer number (5500861).

Almost surely, 2^11001721 is an apocalyptic number.

It is an amenable number.

11001721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11001721 is an equidigital number, since it uses as much as digits as its factorization.

11001721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14, while the sum is 13.

The square root of 11001721 is about 3316.8842307201. The cubic root of 11001721 is about 222.4096068452.

Adding to 11001721 its reverse (12710011), we get a palindrome (23711732).

The spelling of 11001721 in words is "eleven million, one thousand, seven hundred twenty-one".