213212231 has 16 divisors (see below), whose sum is σ = 226652160. Its totient is φ = 200154240.

The previous prime is 213212179. The next prime is 213212261. The reversal of 213212231 is 132212312.

It is a cyclic number.

It is not a de Polignac number, because 213212231 - 2¹⁴ = 213195847 is a prime.

It is a super-2 number, since 2×213212231² = 90918910895994722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213212261) 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, 492191 + ... + 492623.

It is an arithmetic number, because the mean of its divisors is an integer number (14165760).

Almost surely, 2^213212231 is an apocalyptic number.

213212231 is a deficient number, since it is larger than the sum of its proper divisors (13439929).

213212231 is a wasteful number, since it uses less digits than its factorization.

213212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806.

The product of its digits is 144, while the sum is 17.

The square root of 213212231 is about 14601.7886233160. The cubic root of 213212231 is about 597.4075471875.

Adding to 213212231 its reverse (132212312), we get a palindrome (345424543).

The spelling of 213212231 in words is "two hundred thirteen million, two hundred twelve thousand, two hundred thirty-one".