13543221221 has 8 divisors (see below), whose sum is σ = 13839099264. Its totient is φ = 13247665120.

The previous prime is 13543221217. The next prime is 13543221271. The reversal of 13543221221 is 12212234531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13543221221 - 2² = 13543221217 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 (13543221271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5561 + ... + 164673.

It is an arithmetic number, because the mean of its divisors is an integer number (1729887408).

Almost surely, 2^13543221221 is an apocalyptic number.

It is an amenable number.

13543221221 is a deficient number, since it is larger than the sum of its proper divisors (295878043).

13543221221 is a wasteful number, since it uses less digits than its factorization.

13543221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160971.

The product of its digits is 2880, while the sum is 26.

Adding to 13543221221 its reverse (12212234531), we get a palindrome (25755455752).

The spelling of 13543221221 in words is "thirteen billion, five hundred forty-three million, two hundred twenty-one thousand, two hundred twenty-one".