13106578421 has 4 divisors (see below), whose sum is σ = 13106868192. Its totient is φ = 13106288652.

The previous prime is 13106578393. The next prime is 13106578439. The reversal of 13106578421 is 12487560131.

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 13106578421 - 2²² = 13102384117 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 (13106578481) 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, 60755 + ... + 172928.

It is an arithmetic number, because the mean of its divisors is an integer number (3276717048).

Almost surely, 2^13106578421 is an apocalyptic number.

It is an amenable number.

13106578421 is a deficient number, since it is larger than the sum of its proper divisors (289771).

13106578421 is an equidigital number, since it uses as much as digits as its factorization.

13106578421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289770.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 13106578421 in words is "thirteen billion, one hundred six million, five hundred seventy-eight thousand, four hundred twenty-one".