212420231 has 2 divisors, whose sum is σ = 212420232. Its totient is φ = 212420230.

The previous prime is 212420207. The next prime is 212420251. The reversal of 212420231 is 132024212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212420231 is a prime.

It is a super-2 number, since 2×212420231² = 90244709076186722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212420251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106210115 + 106210116.

It is an arithmetic number, because the mean of its divisors is an integer number (106210116).

Almost surely, 2^212420231 is an apocalyptic number.

212420231 is a deficient number, since it is larger than the sum of its proper divisors (1).

212420231 is an equidigital number, since it uses as much as digits as its factorization.

212420231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 212420231 is about 14574.6434261700. The cubic root of 212420231 is about 596.6669176297. Note that the first 3 decimals are identical.

Adding to 212420231 its reverse (132024212), we get a palindrome (344444443).

The spelling of 212420231 in words is "two hundred twelve million, four hundred twenty thousand, two hundred thirty-one".