135205135121 has 8 divisors (see below), whose sum is σ = 154640977920. Its totient is φ = 115799498208.

The previous prime is 135205135111. The next prime is 135205135123. The reversal of 135205135121 is 121531502531.

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 135205135121 - 2⁶ = 135205135057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135205135123) 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, 7541876 + ... + 7559781.

It is an arithmetic number, because the mean of its divisors is an integer number (19330122240).

Almost surely, 2^135205135121 is an apocalyptic number.

It is an amenable number.

135205135121 is a deficient number, since it is larger than the sum of its proper divisors (19435842799).

135205135121 is a wasteful number, since it uses less digits than its factorization.

135205135121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15102943.

The product of its (nonzero) digits is 4500, while the sum is 29.

Adding to 135205135121 its reverse (121531502531), we get a palindrome (256736637652).

The spelling of 135205135121 in words is "one hundred thirty-five billion, two hundred five million, one hundred thirty-five thousand, one hundred twenty-one".