135021042 has 96 divisors (see below), whose sum is σ = 330810480. Its totient is φ = 39513600.

The previous prime is 135021037. The next prime is 135021043. The reversal of 135021042 is 240120531.

It can be written as a sum of positive squares in 8 ways, for example, as 118788201 + 16232841 = 10899^2 + 4029^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (135021043) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 685288 + ... + 685484.

Almost surely, 2^135021042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135021042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165405240).

135021042 is an abundant number, since it is smaller than the sum of its proper divisors (195789438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135021042 is a wasteful number, since it uses less digits than its factorization.

135021042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 135021042 is about 11619.8555068469. The cubic root of 135021042 is about 513.0194354435.

Adding to 135021042 its reverse (240120531), we get a palindrome (375141573).

The spelling of 135021042 in words is "one hundred thirty-five million, twenty-one thousand, forty-two".