135221313 has 4 divisors (see below), whose sum is σ = 180295088. Its totient is φ = 90147540.

The previous prime is 135221297. The next prime is 135221341. The reversal of 135221313 is 313122531.

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.

It is not a de Polignac number, because 135221313 - 2⁴ = 135221297 is a prime.

It is a super-3 number, since 3×135221313³ (a number of 25 digits) contains 333 as substring.

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 135221313.

It is not an unprimeable number, because it can be changed into a prime (135221353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22536883 + ... + 22536888.

It is an arithmetic number, because the mean of its divisors is an integer number (45073772).

Almost surely, 2^135221313 is an apocalyptic number.

It is an amenable number.

135221313 is a deficient number, since it is larger than the sum of its proper divisors (45073775).

135221313 is an equidigital number, since it uses as much as digits as its factorization.

135221313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45073774.

The product of its digits is 540, while the sum is 21.

The square root of 135221313 is about 11628.4699337445. The cubic root of 135221313 is about 513.2729568146.

Adding to 135221313 its reverse (313122531), we get a palindrome (448343844).

The spelling of 135221313 in words is "one hundred thirty-five million, two hundred twenty-one thousand, three hundred thirteen".