135020121 has 4 divisors (see below), whose sum is σ = 180026832. Its totient is φ = 90013412.

The previous prime is 135020113. The next prime is 135020131. The reversal of 135020121 is 121020531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135020121 - 2³ = 135020113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135020121.

It is not an unprimeable number, because it can be changed into a prime (135020101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22503351 + ... + 22503356.

It is an arithmetic number, because the mean of its divisors is an integer number (45006708).

Almost surely, 2^135020121 is an apocalyptic number.

It is an amenable number.

135020121 is a deficient number, since it is larger than the sum of its proper divisors (45006711).

135020121 is an equidigital number, since it uses as much as digits as its factorization.

135020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45006710.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 135020121 is about 11619.8158763381. The cubic root of 135020121 is about 513.0182689784.

Adding to 135020121 its reverse (121020531), we get a palindrome (256040652).

The spelling of 135020121 in words is "one hundred thirty-five million, twenty thousand, one hundred twenty-one".