10561721017 has 4 divisors (see below), whose sum is σ = 10807342480. Its totient is φ = 10316099556.

The previous prime is 10561720997. The next prime is 10561721063. The reversal of 10561721017 is 71012716501.

It is a happy number.

10561721017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71012716501 = 941 ⋅75465161.

It is not a de Polignac number, because 10561721017 - 2⁷ = 10561720889 is a prime.

It is a super-2 number, since 2×10561721017² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10561721017.

It is not an unprimeable number, because it can be changed into a prime (10561721117) 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 in 3 ways as a sum of consecutive naturals, for example, 122810667 + ... + 122810752.

It is an arithmetic number, because the mean of its divisors is an integer number (2701835620).

Almost surely, 2^10561721017 is an apocalyptic number.

It is an amenable number.

10561721017 is a deficient number, since it is larger than the sum of its proper divisors (245621463).

10561721017 is an equidigital number, since it uses as much as digits as its factorization.

10561721017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245621462.

The product of its (nonzero) digits is 2940, while the sum is 31.

The spelling of 10561721017 in words is "ten billion, five hundred sixty-one million, seven hundred twenty-one thousand, seventeen".