212243231 has 4 divisors (see below), whose sum is σ = 212520000. Its totient is φ = 211966464.

The previous prime is 212243221. The next prime is 212243261. The reversal of 212243231 is 132342212.

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 212243231 - 2¹⁰ = 212242207 is a prime.

It is a super-2 number, since 2×212243231² = 90094378210638722, 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 (212243221) 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, 137231 + ... + 138768.

It is an arithmetic number, because the mean of its divisors is an integer number (53130000).

Almost surely, 2^212243231 is an apocalyptic number.

212243231 is a deficient number, since it is larger than the sum of its proper divisors (276769).

212243231 is an equidigital number, since it uses as much as digits as its factorization.

212243231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276768.

The product of its digits is 576, while the sum is 20.

The square root of 212243231 is about 14568.5699710026. The cubic root of 212243231 is about 596.5011465528.

Adding to 212243231 its reverse (132342212), we get a palindrome (344585443).

The spelling of 212243231 in words is "two hundred twelve million, two hundred forty-three thousand, two hundred thirty-one".