135221404 has 24 divisors (see below), whose sum is σ = 252514640. Its totient is φ = 63172224.

The previous prime is 135221381. The next prime is 135221441. The reversal of 135221404 is 404122531.

135221404 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6639 + ... + 17734.

Almost surely, 2^135221404 is an apocalyptic number.

It is an amenable number.

135221404 is a deficient number, since it is larger than the sum of its proper divisors (117293236).

135221404 is a wasteful number, since it uses less digits than its factorization.

135221404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24469 (or 24467 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 135221404 is about 11628.4738465544. The cubic root of 135221404 is about 513.2730719538.

Adding to 135221404 its reverse (404122531), we get a palindrome (539343935).

The spelling of 135221404 in words is "one hundred thirty-five million, two hundred twenty-one thousand, four hundred four".