13535521020 has 144 divisors (see below), whose sum is σ = 46956768768. Its totient is φ = 3091616640.

The previous prime is 13535520997. The next prime is 13535521031. The reversal of 13535521020 is 2012553531.

It is a happy number.

13535521020 is a `hidden beast` number, since 1 + 3 + 5 + 3 + 552 + 102 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2304127 + ... + 2309993.

It is an arithmetic number, because the mean of its divisors is an integer number (326088672).

Almost surely, 2^13535521020 is an apocalyptic number.

13535521020 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 13535521020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23478384384).

13535521020 is an abundant number, since it is smaller than the sum of its proper divisors (33421247748).

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

13535521020 is a wasteful number, since it uses less digits than its factorization.

13535521020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720 (or 7715 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The spelling of 13535521020 in words is "thirteen billion, five hundred thirty-five million, five hundred twenty-one thousand, twenty".