135342021 has 8 divisors (see below), whose sum is σ = 182053440. Its totient is φ = 89429312.

The previous prime is 135342017. The next prime is 135342023. The reversal of 135342021 is 120243531.

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 135342021 - 2² = 135342017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135342023) by changing a digit.

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, 199281 + ... + 199958.

It is an arithmetic number, because the mean of its divisors is an integer number (22756680).

Almost surely, 2^135342021 is an apocalyptic number.

It is an amenable number.

135342021 is a deficient number, since it is larger than the sum of its proper divisors (46711419).

135342021 is a wasteful number, since it uses less digits than its factorization.

135342021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399355.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 135342021 is about 11633.6589686994. The cubic root of 135342021 is about 513.4256391701.

Adding to 135342021 its reverse (120243531), we get a palindrome (255585552).

The spelling of 135342021 in words is "one hundred thirty-five million, three hundred forty-two thousand, twenty-one".