212344421 has 2 divisors, whose sum is σ = 212344422. Its totient is φ = 212344420.

The previous prime is 212344411. The next prime is 212344423. The reversal of 212344421 is 124443212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157377025 + 54967396 = 12545^2 + 7414^2 .

It is a cyclic number.

It is not a de Polignac number, because 212344421 - 2⁶ = 212344357 is a prime.

Together with 212344423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212344423) 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, 106172210 + 106172211.

It is an arithmetic number, because the mean of its divisors is an integer number (106172211).

Almost surely, 2^212344421 is an apocalyptic number.

It is an amenable number.

212344421 is a deficient number, since it is larger than the sum of its proper divisors (1).

212344421 is an equidigital number, since it uses as much as digits as its factorization.

212344421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 23.

The square root of 212344421 is about 14572.0424443521. The cubic root of 212344421 is about 596.5959283130.

Adding to 212344421 its reverse (124443212), we get a palindrome (336787633).

The spelling of 212344421 in words is "two hundred twelve million, three hundred forty-four thousand, four hundred twenty-one".