13431111313521 has 16 divisors (see below), whose sum is σ = 19827746419968. Its totient is φ = 8018573917200.

The previous prime is 13431111313519. The next prime is 13431111313537. The reversal of 13431111313521 is 12531311113431.

13431111313521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13431111313521 - 2¹ = 13431111313519 is a prime.

It is a super-2 number, since 2×13431111313521² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13431111313561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3037336395 + ... + 3037340816.

It is an arithmetic number, because the mean of its divisors is an integer number (1239234151248).

Almost surely, 2^{13431111313521} is an apocalyptic number.

13431111313521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13431111313521 is a deficient number, since it is larger than the sum of its proper divisors (6396635106447).

13431111313521 is a wasteful number, since it uses less digits than its factorization.

13431111313521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6074677292.

The product of its digits is 3240, while the sum is 30.

Adding to 13431111313521 its reverse (12531311113431), we get a palindrome (25962422426952).

The spelling of 13431111313521 in words is "thirteen trillion, four hundred thirty-one billion, one hundred eleven million, three hundred thirteen thousand, five hundred twenty-one".