135302442521 has 4 divisors (see below), whose sum is σ = 135650264100. Its totient is φ = 134954620944.

The previous prime is 135302442503. The next prime is 135302442523. The reversal of 135302442521 is 125244203531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125244203531 = 29 ⋅4318765639.

It can be written as a sum of positive squares in 2 ways, for example, as 97009823296 + 38292619225 = 311464^2 + 195685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135302442521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135302442523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173910206 + ... + 173910983.

It is an arithmetic number, because the mean of its divisors is an integer number (33912566025).

Almost surely, 2^135302442521 is an apocalyptic number.

It is an amenable number.

135302442521 is a deficient number, since it is larger than the sum of its proper divisors (347821579).

135302442521 is an equidigital number, since it uses as much as digits as its factorization.

135302442521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347821578.

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 135302442521 in words is "one hundred thirty-five billion, three hundred two million, four hundred forty-two thousand, five hundred twenty-one".