13126170021 has 4 divisors (see below), whose sum is σ = 17501560032. Its totient is φ = 8750780012.

The previous prime is 13126170017. The next prime is 13126170023. The reversal of 13126170021 is 12007162131.

13126170021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12007162131 = 3 ⋅4002387377.

It is a cyclic number.

It is not a de Polignac number, because 13126170021 - 2² = 13126170017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13126169973 and 13126170000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13126170023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2187695001 + ... + 2187695006.

It is an arithmetic number, because the mean of its divisors is an integer number (4375390008).

Almost surely, 2^13126170021 is an apocalyptic number.

It is an amenable number.

13126170021 is a deficient number, since it is larger than the sum of its proper divisors (4375390011).

13126170021 is an equidigital number, since it uses as much as digits as its factorization.

13126170021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4375390010.

The product of its (nonzero) digits is 504, while the sum is 24.

The spelling of 13126170021 in words is "thirteen billion, one hundred twenty-six million, one hundred seventy thousand, twenty-one".