135607221 has 12 divisors (see below), whose sum is σ = 196109472. Its totient is φ = 90297576.

The previous prime is 135607207. The next prime is 135607229. The reversal of 135607221 is 122706531.

It is a happy number.

135607221 is a `hidden beast` number, since 1 + 35 + 607 + 2 + 21 = 666.

It is not a de Polignac number, because 135607221 - 2⁷ = 135607093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135607229) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 511 + ... + 16476.

It is an arithmetic number, because the mean of its divisors is an integer number (16342456).

Almost surely, 2^135607221 is an apocalyptic number.

It is an amenable number.

135607221 is a deficient number, since it is larger than the sum of its proper divisors (60502251).

135607221 is a wasteful number, since it uses less digits than its factorization.

135607221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17880 (or 17877 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 135607221 is about 11645.0513523986. The cubic root of 135607221 is about 513.7607694832.

The spelling of 135607221 in words is "one hundred thirty-five million, six hundred seven thousand, two hundred twenty-one".