135221321354305 has 8 divisors (see below), whose sum is σ = 162291519110952. Its totient is φ = 108159768092928.

The previous prime is 135221321354303. The next prime is 135221321354347. The reversal of 135221321354305 is 503453123122531.

It can be written as a sum of positive squares in 4 ways, for example, as 17450729243649 + 117770592110656 = 4177407^2 + 10852216^2 .

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 135221321354305 - 2¹ = 135221321354303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135221321354303) 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, 2161089402 + ... + 2161151971.

It is an arithmetic number, because the mean of its divisors is an integer number (20286439888869).

Almost surely, 2^{135221321354305} is an apocalyptic number.

It is an amenable number.

135221321354305 is a deficient number, since it is larger than the sum of its proper divisors (27070197756647).

135221321354305 is an equidigital number, since it uses as much as digits as its factorization.

135221321354305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4322247635.

The product of its (nonzero) digits is 324000, while the sum is 40.

Adding to 135221321354305 its reverse (503453123122531), we get a palindrome (638674444476836).

The spelling of 135221321354305 in words is "one hundred thirty-five trillion, two hundred twenty-one billion, three hundred twenty-one million, three hundred fifty-four thousand, three hundred five".