135221522 has 4 divisors (see below), whose sum is σ = 202832286. Its totient is φ = 67610760.

The previous prime is 135221521. The next prime is 135221533. The reversal of 135221522 is 225122531.

135221522 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 225122531 = 199 ⋅1131269.

It can be written as a sum of positive squares in only one way, i.e., 126990361 + 8231161 = 11269^2 + 2869^2 .

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 as a sum of consecutive naturals, namely, 33805379 + ... + 33805382.

Almost surely, 2^135221522 is an apocalyptic number.

135221522 is a deficient number, since it is larger than the sum of its proper divisors (67610764).

135221522 is an equidigital number, since it uses as much as digits as its factorization.

135221522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67610763.

The product of its digits is 1200, while the sum is 23.

The square root of 135221522 is about 11628.4789203060. The cubic root of 135221522 is about 513.2732212551.

The spelling of 135221522 in words is "one hundred thirty-five million, two hundred twenty-one thousand, five hundred twenty-two".