13524450221 has 4 divisors (see below), whose sum is σ = 13561301952. Its totient is φ = 13487598492.

The previous prime is 13524450187. The next prime is 13524450223. The reversal of 13524450221 is 12205442531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12205442531 = 77171 ⋅158161.

It is a cyclic number.

It is not a de Polignac number, because 13524450221 - 2²⁶ = 13457341357 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 (13524450223) 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, 18425315 + ... + 18426048.

It is an arithmetic number, because the mean of its divisors is an integer number (3390325488).

Almost surely, 2^13524450221 is an apocalyptic number.

It is an amenable number.

13524450221 is a deficient number, since it is larger than the sum of its proper divisors (36851731).

13524450221 is an equidigital number, since it uses as much as digits as its factorization.

13524450221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36851730.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 13524450221 its reverse (12205442531), we get a palindrome (25729892752).

The spelling of 13524450221 in words is "thirteen billion, five hundred twenty-four million, four hundred fifty thousand, two hundred twenty-one".