13456421543987 has 4 divisors (see below), whose sum is σ = 13456429268400. Its totient is φ = 13456413819576.

The previous prime is 13456421543959. The next prime is 13456421544011. The reversal of 13456421543987 is 78934512465431.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13456421543987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13456421543087) 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, 118514 + ... + 5189112.

It is an arithmetic number, because the mean of its divisors is an integer number (3364107317100).

Almost surely, 2^{13456421543987} is an apocalyptic number.

13456421543987 is a deficient number, since it is larger than the sum of its proper divisors (7724413).

13456421543987 is an equidigital number, since it uses as much as digits as its factorization.

13456421543987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7724412.

The product of its digits is 87091200, while the sum is 62.

The spelling of 13456421543987 in words is "thirteen trillion, four hundred fifty-six billion, four hundred twenty-one million, five hundred forty-three thousand, nine hundred eighty-seven".