13231221313544 has 24 divisors (see below), whose sum is σ = 26863685288010. Its totient is φ = 6106717528704.

The previous prime is 13231221313501. The next prime is 13231221313579. The reversal of 13231221313544 is 44531312213231.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8917450164100 + 4313771149444 = 2986210^2 + 2076962^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4893201797 + ... + 4893204500.

Almost surely, 2^{13231221313544} is an apocalyptic number.

It is an amenable number.

13231221313544 is an abundant number, since it is smaller than the sum of its proper divisors (13632463974466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13231221313544 is a wasteful number, since it uses less digits than its factorization.

13231221313544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9786406329 (or 9786406312 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

Adding to 13231221313544 its reverse (44531312213231), we get a palindrome (57762533526775).

The spelling of 13231221313544 in words is "thirteen trillion, two hundred thirty-one billion, two hundred twenty-one million, three hundred thirteen thousand, five hundred forty-four".