212421233 has 2 divisors, whose sum is σ = 212421234. Its totient is φ = 212421232.

The previous prime is 212421221. The next prime is 212421241. The reversal of 212421233 is 332124212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173396224 + 39025009 = 13168^2 + 6247^2 .

It is a cyclic number.

It is not a de Polignac number, because 212421233 - 2⁸ = 212420977 is a prime.

It is not a weakly prime, because it can be changed into another prime (212421203) 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, 106210616 + 106210617.

It is an arithmetic number, because the mean of its divisors is an integer number (106210617).

Almost surely, 2^212421233 is an apocalyptic number.

It is an amenable number.

212421233 is a deficient number, since it is larger than the sum of its proper divisors (1).

212421233 is an equidigital number, since it uses as much as digits as its factorization.

212421233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 20.

The square root of 212421233 is about 14574.6778008984. The cubic root of 212421233 is about 596.6678558004.

Adding to 212421233 its reverse (332124212), we get a palindrome (544545445).

The spelling of 212421233 in words is "two hundred twelve million, four hundred twenty-one thousand, two hundred thirty-three".