12643442127101 has 4 divisors (see below), whose sum is σ = 13308886449600. Its totient is φ = 11977997804604.

The previous prime is 12643442127097. The next prime is 12643442127223. The reversal of 12643442127101 is 10172124434621.

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 12643442127101 - 2² = 12643442127097 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 (12643442027101) 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, 332722161221 + ... + 332722161258.

It is an arithmetic number, because the mean of its divisors is an integer number (3327221612400).

Almost surely, 2^{12643442127101} is an apocalyptic number.

It is an amenable number.

12643442127101 is a deficient number, since it is larger than the sum of its proper divisors (665444322499).

12643442127101 is an equidigital number, since it uses as much as digits as its factorization.

12643442127101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665444322498.

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 12643442127101 in words is "twelve trillion, six hundred forty-three billion, four hundred forty-two million, one hundred twenty-seven thousand, one hundred one".