13544111021 has 12 divisors (see below), whose sum is σ = 16682183388. Its totient is φ = 10926340992.

The previous prime is 13544111003. The next prime is 13544111029. The reversal of 13544111021 is 12011144531.

It can be written as a sum of positive squares in 2 ways, for example, as 4215255625 + 9328855396 = 64925^2 + 96586^2 .

It is not a de Polignac number, because 13544111021 - 2¹⁴ = 13544094637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13544111029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8128886 + ... + 8130551.

It is an arithmetic number, because the mean of its divisors is an integer number (1390181949).

Almost surely, 2^13544111021 is an apocalyptic number.

It is an amenable number.

13544111021 is a deficient number, since it is larger than the sum of its proper divisors (3138072367).

13544111021 is a wasteful number, since it uses less digits than its factorization.

13544111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16259468 (or 16259461 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 13544111021 its reverse (12011144531), we get a palindrome (25555255552).

The spelling of 13544111021 in words is "thirteen billion, five hundred forty-four million, one hundred eleven thousand, twenty-one".