212231 has 4 divisors (see below), whose sum is σ = 214872. Its totient is φ = 209592.

The previous prime is 212227. The next prime is 212239. The reversal of 212231 is 132212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212231 - 2² = 212227 is a prime.

It is a super-2 number, since 2×212231² = 90083994722, 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 (212239) 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, 1196 + ... + 1361.

It is an arithmetic number, because the mean of its divisors is an integer number (53718).

2²¹²²³¹ is an apocalyptic number.

212231 is a deficient number, since it is larger than the sum of its proper divisors (2641).

212231 is an equidigital number, since it uses as much as digits as its factorization.

212231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640.

The product of its digits is 24, while the sum is 11.

The square root of 212231 is about 460.6853590033. The cubic root of 212231 is about 59.6489688087.

Adding to 212231 its reverse (132212), we get a palindrome (344443).

The spelling of 212231 in words is "two hundred twelve thousand, two hundred thirty-one".