11671711501221 has 12 divisors (see below), whose sum is σ = 17032944391372. Its totient is φ = 7700923051776.

The previous prime is 11671711501199. The next prime is 11671711501231. The reversal of 11671711501221 is 12210511717611.

11671711501221 is a `hidden beast` number, since 1 + 1 + 67 + 1 + 71 + 1 + 501 + 2 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2849296736196 + 8822414765025 = 1687986^2 + 2970255^2 .

It is not a de Polignac number, because 11671711501221 - 2¹⁴ = 11671711484837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11671711501231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6684828166 + ... + 6684829911.

Almost surely, 2^{11671711501221} is an apocalyptic number.

It is an amenable number.

11671711501221 is a deficient number, since it is larger than the sum of its proper divisors (5361232890151).

11671711501221 is a wasteful number, since it uses less digits than its factorization.

11671711501221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13369658180 (or 13369658177 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 36.

The spelling of 11671711501221 in words is "eleven trillion, six hundred seventy-one billion, seven hundred eleven million, five hundred one thousand, two hundred twenty-one".