13521025220 has 24 divisors (see below), whose sum is σ = 28402320408. Its totient is φ = 5406854400.

The previous prime is 13521025213. The next prime is 13521025247. The reversal of 13521025220 is 2252012531.

13521025220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1096801924 + 12424223296 = 33118^2 + 111464^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24641 + ... + 166280.

It is an arithmetic number, because the mean of its divisors is an integer number (1183430017).

Almost surely, 2^13521025220 is an apocalyptic number.

13521025220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13521025220 is an abundant number, since it is smaller than the sum of its proper divisors (14881295188).

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

13521025220 is a wasteful number, since it uses less digits than its factorization.

13521025220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194471 (or 194469 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 13521025220 its reverse (2252012531), we get a palindrome (15773037751).

The spelling of 13521025220 in words is "thirteen billion, five hundred twenty-one million, twenty-five thousand, two hundred twenty".