135543221 has 8 divisors (see below), whose sum is σ = 148007424. Its totient is φ = 123102720.

The previous prime is 135543203. The next prime is 135543229. The reversal of 135543221 is 122345531.

It is a happy number.

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 135543221 - 2¹⁸ = 135281077 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 (135543229) 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, 7340 + ... + 18026.

It is an arithmetic number, because the mean of its divisors is an integer number (18500928).

Almost surely, 2^135543221 is an apocalyptic number.

135543221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135543221 is a deficient number, since it is larger than the sum of its proper divisors (12464203).

135543221 is a wasteful number, since it uses less digits than its factorization.

135543221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11851.

The product of its digits is 3600, while the sum is 26.

The square root of 135543221 is about 11642.3030797175. The cubic root of 135543221 is about 513.6799334159.

Adding to 135543221 its reverse (122345531), we get a palindrome (257888752).

The spelling of 135543221 in words is "one hundred thirty-five million, five hundred forty-three thousand, two hundred twenty-one".