135403203521 has 8 divisors (see below), whose sum is σ = 136200069480. Its totient is φ = 134606500992.

The previous prime is 135403203503. The next prime is 135403203547. The reversal of 135403203521 is 125302304531.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9758476225 + 125644727296 = 98785^2 + 354464^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135403203521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135403203721) 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, 1887335 + ... + 1957763.

It is an arithmetic number, because the mean of its divisors is an integer number (17025008685).

Almost surely, 2^135403203521 is an apocalyptic number.

It is an amenable number.

135403203521 is a deficient number, since it is larger than the sum of its proper divisors (796865959).

135403203521 is a wasteful number, since it uses less digits than its factorization.

135403203521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81715.

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 135403203521 in words is "one hundred thirty-five billion, four hundred three million, two hundred three thousand, five hundred twenty-one".