13535144021 has 6 divisors (see below), whose sum is σ = 15744963510. Its totient is φ = 11601551976.

The previous prime is 13535143933. The next prime is 13535144033. The reversal of 13535144021 is 12044153531.

It can be written as a sum of positive squares in only one way, i.e., 9233095921 + 4302048100 = 96089^2 + 65590^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13535144021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13535164021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138113666 + ... + 138113763.

It is an arithmetic number, because the mean of its divisors is an integer number (2624160585).

Almost surely, 2^13535144021 is an apocalyptic number.

It is an amenable number.

13535144021 is a deficient number, since it is larger than the sum of its proper divisors (2209819489).

13535144021 is an equidigital number, since it uses as much as digits as its factorization.

13535144021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276227443 (or 276227436 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 13535144021 its reverse (12044153531), we get a palindrome (25579297552).

The spelling of 13535144021 in words is "thirteen billion, five hundred thirty-five million, one hundred forty-four thousand, twenty-one".