135213211 has 4 divisors (see below), whose sum is σ = 154529392. Its totient is φ = 115897032.

The previous prime is 135213209. The next prime is 135213233. The reversal of 135213211 is 112312531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112312531 = 419 ⋅268049.

It is a cyclic number.

It is not a de Polignac number, because 135213211 - 2¹ = 135213209 is a prime.

It is a super-2 number, since 2×135213211² = 36565224857861042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135213241) 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, 9658080 + ... + 9658093.

It is an arithmetic number, because the mean of its divisors is an integer number (38632348).

Almost surely, 2^135213211 is an apocalyptic number.

135213211 is a deficient number, since it is larger than the sum of its proper divisors (19316181).

135213211 is an equidigital number, since it uses as much as digits as its factorization.

135213211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19316180.

The product of its digits is 180, while the sum is 19.

The square root of 135213211 is about 11628.1215593921. The cubic root of 135213211 is about 513.2627054214.

Adding to 135213211 its reverse (112312531), we get a palindrome (247525742).

It can be divided in two parts, 135213 and 211, that added together give a square (135424 = 368²).

The spelling of 135213211 in words is "one hundred thirty-five million, two hundred thirteen thousand, two hundred eleven".