12157706452121 has 4 divisors (see below), whose sum is σ = 12158060247552. Its totient is φ = 12157352656692.

The previous prime is 12157706452117. The next prime is 12157706452163. The reversal of 12157706452121 is 12125460775121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12157706452121 - 2² = 12157706452117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12157706482121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176846165 + ... + 176914898.

It is an arithmetic number, because the mean of its divisors is an integer number (3039515061888).

Almost surely, 2^{12157706452121} is an apocalyptic number.

It is an amenable number.

12157706452121 is a deficient number, since it is larger than the sum of its proper divisors (353795431).

12157706452121 is an equidigital number, since it uses as much as digits as its factorization.

12157706452121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353795430.

The product of its (nonzero) digits is 235200, while the sum is 44.

The spelling of 12157706452121 in words is "twelve trillion, one hundred fifty-seven billion, seven hundred six million, four hundred fifty-two thousand, one hundred twenty-one".