13516624021431 has 4 divisors (see below), whose sum is σ = 18022165361912. Its totient is φ = 9011082680952.

The previous prime is 13516624021399. The next prime is 13516624021487. The reversal of 13516624021431 is 13412042661531.

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

It is not a de Polignac number, because 13516624021431 - 2⁵ = 13516624021399 is a prime.

It is a super-2 number, since 2×13516624021431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13516624021431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13516624221431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2252770670236 + ... + 2252770670241.

It is an arithmetic number, because the mean of its divisors is an integer number (4505541340478).

Almost surely, 2^{13516624021431} is an apocalyptic number.

13516624021431 is a deficient number, since it is larger than the sum of its proper divisors (4505541340481).

13516624021431 is an equidigital number, since it uses as much as digits as its factorization.

13516624021431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505541340480.

The product of its (nonzero) digits is 103680, while the sum is 39.

Adding to 13516624021431 its reverse (13412042661531), we get a palindrome (26928666682962).

The spelling of 13516624021431 in words is "thirteen trillion, five hundred sixteen billion, six hundred twenty-four million, twenty-one thousand, four hundred thirty-one".