13560721920 has 240 divisors, whose sum is σ = 48706257600. Its totient is φ = 3616026624.

The previous prime is 13560721913. The next prime is 13560721931. The reversal of 13560721920 is 2912706531.

13560721920 is a `hidden beast` number, since 1 + 3 + 5 + 607 + 21 + 9 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 611181 + ... + 632979.

It is an arithmetic number, because the mean of its divisors is an integer number (202942740).

Almost surely, 2^13560721920 is an apocalyptic number.

13560721920 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 13560721920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24353128800).

13560721920 is an abundant number, since it is smaller than the sum of its proper divisors (35145535680).

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

13560721920 is an frugal number, since it uses more digits than its factorization.

13560721920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21837 (or 21809 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The spelling of 13560721920 in words is "thirteen billion, five hundred sixty million, seven hundred twenty-one thousand, nine hundred twenty".