13524411221 has 4 divisors (see below), whose sum is σ = 13529778444. Its totient is φ = 13519044000.

The previous prime is 13524411209. The next prime is 13524411233. The reversal of 13524411221 is 12211442531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (13524411209) and next prime (13524411233).

It can be written as a sum of positive squares in 2 ways, for example, as 6520562500 + 7003848721 = 80750^2 + 83689^2 .

It is a cyclic number.

It is not a de Polignac number, because 13524411221 - 2¹⁴ = 13524394837 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 (13524411521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2679830 + ... + 2684871.

It is an arithmetic number, because the mean of its divisors is an integer number (3382444611).

Almost surely, 2^13524411221 is an apocalyptic number.

It is an amenable number.

13524411221 is a deficient number, since it is larger than the sum of its proper divisors (5367223).

13524411221 is an equidigital number, since it uses as much as digits as its factorization.

13524411221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5367222.

The product of its digits is 1920, while the sum is 26.

Adding to 13524411221 its reverse (12211442531), we get a palindrome (25735853752).

The spelling of 13524411221 in words is "thirteen billion, five hundred twenty-four million, four hundred eleven thousand, two hundred twenty-one".