13531220424 has 160 divisors (see below), whose sum is σ = 40139668800. Its totient is φ = 4246784640.

The previous prime is 13531220387. The next prime is 13531220501. The reversal of 13531220424 is 42402213531.

13531220424 is a `hidden beast` number, since 13 + 5 + 3 + 1 + 220 + 424 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2052814 + ... + 2059394.

It is an arithmetic number, because the mean of its divisors is an integer number (250872930).

Almost surely, 2^13531220424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13531220424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20069834400).

13531220424 is an abundant number, since it is smaller than the sum of its proper divisors (26608448376).

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

13531220424 is a wasteful number, since it uses less digits than its factorization.

13531220424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6785 (or 6772 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 13531220424 its reverse (42402213531), we get a palindrome (55933433955).

The spelling of 13531220424 in words is "thirteen billion, five hundred thirty-one million, two hundred twenty thousand, four hundred twenty-four".