135221738 has 16 divisors (see below), whose sum is σ = 212155200. Its totient is φ = 64517376.

The previous prime is 135221719. The next prime is 135221741. The reversal of 135221738 is 837122531.

135221738 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17381 + ... + 23927.

It is an arithmetic number, because the mean of its divisors is an integer number (13259700).

Almost surely, 2^135221738 is an apocalyptic number.

135221738 is a deficient number, since it is larger than the sum of its proper divisors (76933462).

135221738 is a wasteful number, since it uses less digits than its factorization.

135221738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021.

The product of its digits is 10080, while the sum is 32.

The square root of 135221738 is about 11628.4882078454. The cubic root of 135221738 is about 513.2734945523.

The spelling of 135221738 in words is "one hundred thirty-five million, two hundred twenty-one thousand, seven hundred thirty-eight".