135222121 has 4 divisors (see below), whose sum is σ = 135296644. Its totient is φ = 135147600.

The previous prime is 135222103. The next prime is 135222181. The reversal of 135222121 is 121222531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121222531 = 257 ⋅471683.

It can be written as a sum of positive squares in 2 ways, for example, as 2073600 + 133148521 = 1440^2 + 11539^2 .

It is a cyclic number.

It is not a de Polignac number, because 135222121 - 2⁵ = 135222089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135222181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34470 + ... + 38191.

It is an arithmetic number, because the mean of its divisors is an integer number (33824161).

Almost surely, 2^135222121 is an apocalyptic number.

It is an amenable number.

135222121 is a deficient number, since it is larger than the sum of its proper divisors (74523).

135222121 is an equidigital number, since it uses as much as digits as its factorization.

135222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74522.

The product of its digits is 240, while the sum is 19.

The square root of 135222121 is about 11628.5046760106. The cubic root of 135222121 is about 513.2739791478.

Adding to 135222121 its reverse (121222531), we get a palindrome (256444652).

The spelling of 135222121 in words is "one hundred thirty-five million, two hundred twenty-two thousand, one hundred twenty-one".