135221208 has 16 divisors (see below), whose sum is σ = 338053080. Its totient is φ = 45073728.

The previous prime is 135221173. The next prime is 135221231. The reversal of 135221208 is 802122531.

135221208 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 5634217 = 135221208 / (1 + 3 + 5 + 2 + 2 + 1 + 2 + 0 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2817085 + ... + 2817132.

Almost surely, 2^135221208 is an apocalyptic number.

It is an amenable number.

135221208 is an abundant number, since it is smaller than the sum of its proper divisors (202831872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135221208 is a wasteful number, since it uses less digits than its factorization.

135221208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5634226 (or 5634222 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 135221208 is about 11628.4654189622. The cubic root of 135221208 is about 513.2728239616.

Adding to 135221208 its reverse (802122531), we get a palindrome (937343739).

The spelling of 135221208 in words is "one hundred thirty-five million, two hundred twenty-one thousand, two hundred eight".