13531122120 has 128 divisors (see below), whose sum is σ = 43464729600. Its totient is φ = 3357843456.

The previous prime is 13531122091. The next prime is 13531122131. The reversal of 13531122120 is 2122113531.

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 31 ways as a sum of consecutive naturals, for example, 144297 + ... + 218823.

It is an arithmetic number, because the mean of its divisors is an integer number (339568200).

Almost surely, 2^13531122120 is an apocalyptic number.

13531122120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13531122120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21732364800).

13531122120 is an abundant number, since it is smaller than the sum of its proper divisors (29933607480).

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

13531122120 is a wasteful number, since it uses less digits than its factorization.

13531122120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74647 (or 74643 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 13531122120 its reverse (2122113531), we get a palindrome (15653235651).

The spelling of 13531122120 in words is "thirteen billion, five hundred thirty-one million, one hundred twenty-two thousand, one hundred twenty".