135224221 has 8 divisors (see below), whose sum is σ = 149385600. Its totient is φ = 121374240.

The previous prime is 135224209. The next prime is 135224237. The reversal of 135224221 is 122422531.

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 135224221 - 2⁵ = 135224189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135224192 and 135224201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135224261) 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, 76936 + ... + 78673.

It is an arithmetic number, because the mean of its divisors is an integer number (18673200).

Almost surely, 2^135224221 is an apocalyptic number.

135224221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135224221 is a deficient number, since it is larger than the sum of its proper divisors (14161379).

135224221 is a wasteful number, since it uses less digits than its factorization.

135224221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155699.

The product of its digits is 960, while the sum is 22.

The square root of 135224221 is about 11628.5949710186. The cubic root of 135224221 is about 513.2766361829.

Adding to 135224221 its reverse (122422531), we get a palindrome (257646752).

The spelling of 135224221 in words is "one hundred thirty-five million, two hundred twenty-four thousand, two hundred twenty-one".