213231135 has 16 divisors (see below), whose sum is σ = 367413984. Its totient is φ = 104975232.

The previous prime is 213231131. The next prime is 213231157. The reversal of 213231135 is 531132312.

It is not a de Polignac number, because 213231135 - 2² = 213231131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213231131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 546552 + ... + 546941.

It is an arithmetic number, because the mean of its divisors is an integer number (22963374).

Almost surely, 2^213231135 is an apocalyptic number.

213231135 is a deficient number, since it is larger than the sum of its proper divisors (154182849).

213231135 is a wasteful number, since it uses less digits than its factorization.

213231135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093514.

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

The square root of 213231135 is about 14602.4359269267. The cubic root of 213231135 is about 597.4252026139.

Adding to 213231135 its reverse (531132312), we get a palindrome (744363447).

The spelling of 213231135 in words is "two hundred thirteen million, two hundred thirty-one thousand, one hundred thirty-five".