135221121 has 12 divisors (see below), whose sum is σ = 223222272. Its totient is φ = 77269176.

The previous prime is 135221089. The next prime is 135221147. The reversal of 135221121 is 121122531.

It is not a de Polignac number, because 135221121 - 2⁵ = 135221089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135221094 and 135221103.

It is not an unprimeable number, because it can be changed into a prime (135221521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1073121 + ... + 1073246.

It is an arithmetic number, because the mean of its divisors is an integer number (18601856).

Almost surely, 2^135221121 is an apocalyptic number.

It is an amenable number.

135221121 is a deficient number, since it is larger than the sum of its proper divisors (88001151).

135221121 is a wasteful number, since it uses less digits than its factorization.

135221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146380 (or 2146377 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 135221121 is about 11628.4616781413. The cubic root of 135221121 is about 513.2727138833.

Adding to 135221121 its reverse (121122531), we get a palindrome (256343652).

The spelling of 135221121 in words is "one hundred thirty-five million, two hundred twenty-one thousand, one hundred twenty-one".