12131165156721 has 8 divisors (see below), whose sum is σ = 17419108943040. Its totient is φ = 7465332404112.

The previous prime is 12131165156717. The next prime is 12131165156741. The reversal of 12131165156721 is 12765156113121.

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

It is not a de Polignac number, because 12131165156721 - 2² = 12131165156717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12131165156741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155527758381 + ... + 155527758458.

It is an arithmetic number, because the mean of its divisors is an integer number (2177388617880).

Almost surely, 2^{12131165156721} is an apocalyptic number.

It is an amenable number.

12131165156721 is a deficient number, since it is larger than the sum of its proper divisors (5287943786319).

12131165156721 is a wasteful number, since it uses less digits than its factorization.

12131165156721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311055516855.

The product of its digits is 75600, while the sum is 42.

The spelling of 12131165156721 in words is "twelve trillion, one hundred thirty-one billion, one hundred sixty-five million, one hundred fifty-six thousand, seven hundred twenty-one".