12157710147721 has 16 divisors (see below), whose sum is σ = 12887757145600. Its totient is φ = 11436778499328.

The previous prime is 12157710147631. The next prime is 12157710147761. The reversal of 12157710147721 is 12774101775121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12157710147721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12157710147761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3073096 + ... + 5810278.

It is an arithmetic number, because the mean of its divisors is an integer number (805484821600).

Almost surely, 2^{12157710147721} is an apocalyptic number.

It is an amenable number.

12157710147721 is a deficient number, since it is larger than the sum of its proper divisors (730046997879).

12157710147721 is a wasteful number, since it uses less digits than its factorization.

12157710147721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738848.

The product of its (nonzero) digits is 192080, while the sum is 46.

The spelling of 12157710147721 in words is "twelve trillion, one hundred fifty-seven billion, seven hundred ten million, one hundred forty-seven thousand, seven hundred twenty-one".