135216213 has 16 divisors (see below), whose sum is σ = 199051776. Its totient is φ = 80960240.

The previous prime is 135216173. The next prime is 135216223. The reversal of 135216213 is 312612531.

It is a cyclic number.

It is not a de Polignac number, because 135216213 - 2¹⁴ = 135199829 is a prime.

It is a super-2 number, since 2×135216213² = 36566848516122738, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135216223) 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 15 ways as a sum of consecutive naturals, for example, 21945 + ... + 27422.

It is an arithmetic number, because the mean of its divisors is an integer number (12440736).

Almost surely, 2^135216213 is an apocalyptic number.

It is an amenable number.

135216213 is a deficient number, since it is larger than the sum of its proper divisors (63835563).

135216213 is a wasteful number, since it uses less digits than its factorization.

135216213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49464.

The product of its digits is 1080, while the sum is 24.

The square root of 135216213 is about 11628.2506422935. The cubic root of 135216213 is about 513.2665038748.

Adding to 135216213 its reverse (312612531), we get a palindrome (447828744).

The spelling of 135216213 in words is "one hundred thirty-five million, two hundred sixteen thousand, two hundred thirteen".