11071186721 has 16 divisors (see below), whose sum is σ = 12746688768. Its totient is φ = 9419424000.

The previous prime is 11071186699. The next prime is 11071186787. The reversal of 11071186721 is 12768117011.

11071186721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-11071186721 is a prime.

It is a super-2 number, since 2×11071186721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11071186121) 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 15 ways as a sum of consecutive naturals, for example, 506621 + ... + 528021.

It is an arithmetic number, because the mean of its divisors is an integer number (796668048).

Almost surely, 2^11071186721 is an apocalyptic number.

It is an amenable number.

11071186721 is a deficient number, since it is larger than the sum of its proper divisors (1675502047).

11071186721 is a wasteful number, since it uses less digits than its factorization.

11071186721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21952.

The product of its (nonzero) digits is 4704, while the sum is 35.

The spelling of 11071186721 in words is "eleven billion, seventy-one million, one hundred eighty-six thousand, seven hundred twenty-one".