135215213 has 4 divisors (see below), whose sum is σ = 154531680. Its totient is φ = 115898748.

The previous prime is 135215173. The next prime is 135215231. The reversal of 135215213 is 312512531.

It is a happy number.

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: 312512531 = 449 ⋅696019.

It is not a de Polignac number, because 135215213 - 2¹⁴ = 135198829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135215293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9658223 + ... + 9658236.

It is an arithmetic number, because the mean of its divisors is an integer number (38632920).

Almost surely, 2^135215213 is an apocalyptic number.

It is an amenable number.

135215213 is a deficient number, since it is larger than the sum of its proper divisors (19316467).

135215213 is an equidigital number, since it uses as much as digits as its factorization.

135215213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19316466.

The product of its digits is 900, while the sum is 23.

The square root of 135215213 is about 11628.2076434849. The cubic root of 135215213 is about 513.2652385734.

Adding to 135215213 its reverse (312512531), we get a palindrome (447727744).

The spelling of 135215213 in words is "one hundred thirty-five million, two hundred fifteen thousand, two hundred thirteen".