12536434271 has 4 divisors (see below), whose sum is σ = 12563279352. Its totient is φ = 12509589192.

The previous prime is 12536434247. The next prime is 12536434363. The reversal of 12536434271 is 17243463521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12536434271 is a prime.

It is a super-2 number, since 2×12536434271² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12536437271) 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, 13421840 + ... + 13422773.

It is an arithmetic number, because the mean of its divisors is an integer number (3140819838).

Almost surely, 2^12536434271 is an apocalyptic number.

12536434271 is a deficient number, since it is larger than the sum of its proper divisors (26845081).

12536434271 is an equidigital number, since it uses as much as digits as its factorization.

12536434271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26845080.

The product of its digits is 120960, while the sum is 38.

Adding to 12536434271 its reverse (17243463521), we get a palindrome (29779897792).

The spelling of 12536434271 in words is "twelve billion, five hundred thirty-six million, four hundred thirty-four thousand, two hundred seventy-one".