212343431 has 2 divisors, whose sum is σ = 212343432. Its totient is φ = 212343430.

The previous prime is 212343421. The next prime is 212343433. The reversal of 212343431 is 134343212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212343431 - 2⁶ = 212343367 is a prime.

It is a super-2 number, since 2×212343431² = 90179465377703522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 212343433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 212343397 and 212343406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212343433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106171715 + 106171716.

It is an arithmetic number, because the mean of its divisors is an integer number (106171716).

Almost surely, 2^212343431 is an apocalyptic number.

212343431 is a deficient number, since it is larger than the sum of its proper divisors (1).

212343431 is an equidigital number, since it uses as much as digits as its factorization.

212343431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 23.

The square root of 212343431 is about 14572.0084751554. The cubic root of 212343431 is about 596.5950011544.

Adding to 212343431 its reverse (134343212), we get a palindrome (346686643).

It can be divided in two parts, 2123 and 43431, that added together give a palindrome (45554).

The spelling of 212343431 in words is "two hundred twelve million, three hundred forty-three thousand, four hundred thirty-one".