13531220404 has 24 divisors (see below), whose sum is σ = 25509102080. Its totient is φ = 6243230304.

The previous prime is 13531220387. The next prime is 13531220501. The reversal of 13531220404 is 40402213531.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134917 + ... + 212755.

Almost surely, 2^13531220404 is an apocalyptic number.

It is an amenable number.

13531220404 is a deficient number, since it is larger than the sum of its proper divisors (11977881676).

13531220404 is a wasteful number, since it uses less digits than its factorization.

13531220404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81199 (or 81197 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 13531220404 its reverse (40402213531), we get a palindrome (53933433935).

The spelling of 13531220404 in words is "thirteen billion, five hundred thirty-one million, two hundred twenty thousand, four hundred four".