11101201721 has 2 divisors, whose sum is σ = 11101201722. Its totient is φ = 11101201720.

The previous prime is 11101201691. The next prime is 11101201729. The reversal of 11101201721 is 12710210111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10791054400 + 310147321 = 103880^2 + 17611^2 .

It is an emirp because it is prime and its reverse (12710210111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11101201721 - 2¹⁰ = 11101200697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11101201721.

It is not a weakly prime, because it can be changed into another prime (11101201729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550600860 + 5550600861.

It is an arithmetic number, because the mean of its divisors is an integer number (5550600861).

Almost surely, 2^11101201721 is an apocalyptic number.

It is an amenable number.

11101201721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11101201721 is an equidigital number, since it uses as much as digits as its factorization.

11101201721 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 17.

Adding to 11101201721 its reverse (12710210111), we get a palindrome (23811411832).

The spelling of 11101201721 in words is "eleven billion, one hundred one million, two hundred one thousand, seven hundred twenty-one".