13523421420 has 72 divisors (see below), whose sum is σ = 42540358224. Its totient is φ = 3606244416.

The previous prime is 13523421383. The next prime is 13523421421. The reversal of 13523421420 is 2412432531.

13523421420 is a `hidden beast` number, since 1 + 3 + 5 + 234 + 2 + 1 + 420 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (13523421421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1386439 + ... + 1396158.

Almost surely, 2^13523421420 is an apocalyptic number.

13523421420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13523421420 is an abundant number, since it is smaller than the sum of its proper divisors (29016936804).

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

13523421420 is a wasteful number, since it uses less digits than its factorization.

13523421420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2782621 (or 2782607 counting only the distinct ones).

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

Adding to 13523421420 its reverse (2412432531), we get a palindrome (15935853951).

The spelling of 13523421420 in words is "thirteen billion, five hundred twenty-three million, four hundred twenty-one thousand, four hundred twenty".