212306231 has 4 divisors (see below), whose sum is σ = 212350992. Its totient is φ = 212261472.

The previous prime is 212306221. The next prime is 212306239. The reversal of 212306231 is 132603212.

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 212306231 - 2¹⁰ = 212305207 is a prime.

It is a super-2 number, since 2×212306231² = 90147871442850722, 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 (212306239) 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, 14291 + ... + 25076.

It is an arithmetic number, because the mean of its divisors is an integer number (53087748).

Almost surely, 2^212306231 is an apocalyptic number.

212306231 is a deficient number, since it is larger than the sum of its proper divisors (44761).

212306231 is an equidigital number, since it uses as much as digits as its factorization.

212306231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44760.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 212306231 is about 14570.7319994570. The cubic root of 212306231 is about 596.5601603777.

Adding to 212306231 its reverse (132603212), we get a palindrome (344909443).

The spelling of 212306231 in words is "two hundred twelve million, three hundred six thousand, two hundred thirty-one".