135512221 has 8 divisors (see below), whose sum is σ = 149330720. Its totient is φ = 122178672.

The previous prime is 135512213. The next prime is 135512231. The reversal of 135512221 is 122215531.

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 135512221 - 2³ = 135512213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135512192 and 135512201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135512231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120651 + ... + 121768.

It is an arithmetic number, because the mean of its divisors is an integer number (18666340).

Almost surely, 2^135512221 is an apocalyptic number.

It is an amenable number.

135512221 is a deficient number, since it is larger than the sum of its proper divisors (13818499).

135512221 is a wasteful number, since it uses less digits than its factorization.

135512221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242475.

The product of its digits is 600, while the sum is 22.

The square root of 135512221 is about 11640.9716518854. The cubic root of 135512221 is about 513.6407692980.

Adding to 135512221 its reverse (122215531), we get a palindrome (257727752).

The spelling of 135512221 in words is "one hundred thirty-five million, five hundred twelve thousand, two hundred twenty-one".