231212223 has 96 divisors (see below), whose sum is σ = 409743360. Its totient is φ = 124001280.

The previous prime is 231212213. The next prime is 231212231. The reversal of 231212223 is 322212132.

231212223 is a `hidden beast` number, since 231 + 212 + 223 = 666.

231212223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231212223 - 2¹² = 231208127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231212196 and 231212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231212213) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2926698 + ... + 2926776.

It is an arithmetic number, because the mean of its divisors is an integer number (4268160).

Almost surely, 2^231212223 is an apocalyptic number.

231212223 is a deficient number, since it is larger than the sum of its proper divisors (178531137).

231212223 is a wasteful number, since it uses less digits than its factorization.

231212223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 194 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 231212223 is about 15205.6641749054. The cubic root of 231212223 is about 613.7670877919.

Adding to 231212223 its reverse (322212132), we get a palindrome (553424355).

Subtracting 231212223 from its reverse (322212132), we obtain a palindrome (90999909).

It can be divided in two parts, 2312 and 12223, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 231212223 in words is "two hundred thirty-one million, two hundred twelve thousand, two hundred twenty-three".