13523352220 has 144 divisors (see below), whose sum is σ = 34859704320. Its totient is φ = 4381776000.

The previous prime is 13523352191. The next prime is 13523352223. The reversal of 13523352220 is 2225332531.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13523352223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11748645 + ... + 11749795.

It is an arithmetic number, because the mean of its divisors is an integer number (242081280).

Almost surely, 2^13523352220 is an apocalyptic number.

13523352220 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 13523352220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17429852160).

13523352220 is an abundant number, since it is smaller than the sum of its proper divisors (21336352100).

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

13523352220 is a wasteful number, since it uses less digits than its factorization.

13523352220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824 (or 1815 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 13523352220 its reverse (2225332531), we get a palindrome (15748684751).

The spelling of 13523352220 in words is "thirteen billion, five hundred twenty-three million, three hundred fifty-two thousand, two hundred twenty".