212120003 has 2 divisors, whose sum is σ = 212120004. Its totient is φ = 212120002.

The previous prime is 212119991. The next prime is 212120017. The reversal of 212120003 is 300021212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212120003 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212120023) 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, 106060001 + 106060002.

It is an arithmetic number, because the mean of its divisors is an integer number (106060002).

Almost surely, 2^212120003 is an apocalyptic number.

212120003 is a deficient number, since it is larger than the sum of its proper divisors (1).

212120003 is an equidigital number, since it uses as much as digits as its factorization.

212120003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 212120003 is about 14564.3401155013. The cubic root of 212120003 is about 596.3856817419.

Adding to 212120003 its reverse (300021212), we get a palindrome (512141215).

The spelling of 212120003 in words is "two hundred twelve million, one hundred twenty thousand, three".