212312231 has 2 divisors, whose sum is σ = 212312232. Its totient is φ = 212312230.

The previous prime is 212312173. The next prime is 212312237. The reversal of 212312231 is 132213212.

212312231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212312231 is a prime.

It is a super-2 number, since 2×212312231² = 90152966864394722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212312237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106156115 + 106156116.

It is an arithmetic number, because the mean of its divisors is an integer number (106156116).

Almost surely, 2^212312231 is an apocalyptic number.

212312231 is a deficient number, since it is larger than the sum of its proper divisors (1).

212312231 is an equidigital number, since it uses as much as digits as its factorization.

212312231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 17.

The square root of 212312231 is about 14570.9378901977. The cubic root of 212312231 is about 596.5657801331.

Adding to 212312231 its reverse (132213212), we get a palindrome (344525443).

The spelling of 212312231 in words is "two hundred twelve million, three hundred twelve thousand, two hundred thirty-one".