135502021 has 4 divisors (see below), whose sum is σ = 135691200. Its totient is φ = 135312844.

The previous prime is 135502013. The next prime is 135502027. The reversal of 135502021 is 120205531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120205531 = 79 ⋅1521589.

It is a cyclic number.

It is not a de Polignac number, because 135502021 - 2³ = 135502013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135502021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135502027) 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 3 ways as a sum of consecutive naturals, for example, 93511 + ... + 94948.

It is an arithmetic number, because the mean of its divisors is an integer number (33922800).

Almost surely, 2^135502021 is an apocalyptic number.

It is an amenable number.

135502021 is a deficient number, since it is larger than the sum of its proper divisors (189179).

135502021 is an equidigital number, since it uses as much as digits as its factorization.

135502021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189178.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 135502021 is about 11640.5335358823. The cubic root of 135502021 is about 513.6278817339.

Adding to 135502021 its reverse (120205531), we get a palindrome (255707552).

The spelling of 135502021 in words is "one hundred thirty-five million, five hundred two thousand, twenty-one".