135221015 has 8 divisors (see below), whose sum is σ = 162375840. Its totient is φ = 108103072.

The previous prime is 135220973. The next prime is 135221033. The reversal of 135221015 is 510122531.

It is a happy number.

135221015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 135221015 - 2¹⁶ = 135155479 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380 + ... + 16449.

It is an arithmetic number, because the mean of its divisors is an integer number (20296980).

Almost surely, 2^135221015 is an apocalyptic number.

135221015 is a deficient number, since it is larger than the sum of its proper divisors (27154825).

135221015 is a wasteful number, since it uses less digits than its factorization.

135221015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18441.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 135221015 is about 11628.4571203578. The cubic root of 135221015 is about 513.2725797649.

Adding to 135221015 its reverse (510122531), we get a palindrome (645343546).

The spelling of 135221015 in words is "one hundred thirty-five million, two hundred twenty-one thousand, fifteen".