135142021 has 8 divisors (see below), whose sum is σ = 155302784. Its totient is φ = 115194960.

The previous prime is 135141983. The next prime is 135142057. The reversal of 135142021 is 120241531.

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 135142021 - 2¹³ = 135133829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135142021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135142081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52065 + ... + 54598.

It is an arithmetic number, because the mean of its divisors is an integer number (19412848).

Almost surely, 2^135142021 is an apocalyptic number.

It is an amenable number.

135142021 is a deficient number, since it is larger than the sum of its proper divisors (20160763).

135142021 is a wasteful number, since it uses less digits than its factorization.

135142021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106851.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 135142021 is about 11625.0600428557. The cubic root of 135142021 is about 513.1726116940.

Adding to 135142021 its reverse (120241531), we get a palindrome (255383552).

The spelling of 135142021 in words is "one hundred thirty-five million, one hundred forty-two thousand, twenty-one".