10561721015 has 8 divisors (see below), whose sum is σ = 12913198848. Its totient is φ = 8289954400.

The previous prime is 10561720997. The next prime is 10561721063. The reversal of 10561721015 is 51012716501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10561721015 - 2¹⁸ = 10561458871 is a prime.

It is a super-2 number, since 2×10561721015² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19927511 + ... + 19928040.

It is an arithmetic number, because the mean of its divisors is an integer number (1614149856).

Almost surely, 2^10561721015 is an apocalyptic number.

10561721015 is a deficient number, since it is larger than the sum of its proper divisors (2351477833).

10561721015 is an equidigital number, since it uses as much as digits as its factorization.

10561721015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39855609.

The product of its (nonzero) digits is 2100, while the sum is 29.

The spelling of 10561721015 in words is "ten billion, five hundred sixty-one million, seven hundred twenty-one thousand, fifteen".