11971288131021 has 6 divisors (see below), whose sum is σ = 17291860633710. Its totient is φ = 7980858754008.

The previous prime is 11971288130983. The next prime is 11971288131073. The reversal of 11971288131021 is 12013188217911.

11971288131021 is a `hidden beast` number, since 1 + 197 + 128 + 8 + 1 + 310 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11917781501796 + 53506629225 = 3452214^2 + 231315^2 .

It is not a de Polignac number, because 11971288131021 - 2¹⁴ = 11971288114637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11971288131821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 665071562826 + ... + 665071562843.

It is an arithmetic number, because the mean of its divisors is an integer number (2881976772285).

Almost surely, 2^{11971288131021} is an apocalyptic number.

It is an amenable number.

11971288131021 is a deficient number, since it is larger than the sum of its proper divisors (5320572502689).

11971288131021 is a wasteful number, since it uses less digits than its factorization.

11971288131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330143125675 (or 1330143125672 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 45.

The spelling of 11971288131021 in words is "eleven trillion, nine hundred seventy-one billion, two hundred eighty-eight million, one hundred thirty-one thousand, twenty-one".