13121314432431 has 4 divisors (see below), whose sum is σ = 17495085909912. Its totient is φ = 8747542954952.

The previous prime is 13121314432393. The next prime is 13121314432459. The reversal of 13121314432431 is 13423441312131.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 13121314432431 - 2²³ = 13121306043823 is a prime.

It is a super-2 number, since 2×13121314432431² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13121314432392 and 13121314432401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121314432931) 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, 2186885738736 + ... + 2186885738741.

It is an arithmetic number, because the mean of its divisors is an integer number (4373771477478).

Almost surely, 2^{13121314432431} is an apocalyptic number.

13121314432431 is a deficient number, since it is larger than the sum of its proper divisors (4373771477481).

13121314432431 is an equidigital number, since it uses as much as digits as its factorization.

13121314432431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4373771477480.

The product of its digits is 20736, while the sum is 33.

Adding to 13121314432431 its reverse (13423441312131), we get a palindrome (26544755744562).

The spelling of 13121314432431 in words is "thirteen trillion, one hundred twenty-one billion, three hundred fourteen million, four hundred thirty-two thousand, four hundred thirty-one".