212323231 has 4 divisors (see below), whose sum is σ = 212784264. Its totient is φ = 211862200.

The previous prime is 212323229. The next prime is 212323259. The reversal of 212323231 is 132323212.

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 212323231 - 2¹ = 212323229 is a prime.

It is a super-2 number, since 2×212323231² = 90162308844558722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212323199 and 212323208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212323211) 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, 229825 + ... + 230746.

It is an arithmetic number, because the mean of its divisors is an integer number (53196066).

Almost surely, 2^212323231 is an apocalyptic number.

212323231 is a deficient number, since it is larger than the sum of its proper divisors (461033).

212323231 is an equidigital number, since it uses as much as digits as its factorization.

212323231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461032.

The product of its digits is 432, while the sum is 19.

The square root of 212323231 is about 14571.3153489999. The cubic root of 212323231 is about 596.5760827430.

Subtracting from 212323231 its sum of digits (19), we obtain a palindrome (212323212).

Adding to 212323231 its reverse (132323212), we get a palindrome (344646443).

The spelling of 212323231 in words is "two hundred twelve million, three hundred twenty-three thousand, two hundred thirty-one".