212113009 has 2 divisors, whose sum is σ = 212113010. Its totient is φ = 212113008.

The previous prime is 212113007. The next prime is 212113039. The reversal of 212113009 is 900311212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121330225 + 90782784 = 11015^2 + 9528^2 .

It is a cyclic number.

It is not a de Polignac number, because 212113009 - 2¹ = 212113007 is a prime.

Together with 212113007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (212113007) 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, 106056504 + 106056505.

It is an arithmetic number, because the mean of its divisors is an integer number (106056505).

Almost surely, 2^212113009 is an apocalyptic number.

It is an amenable number.

212113009 is a deficient number, since it is larger than the sum of its proper divisors (1).

212113009 is an equidigital number, since it uses as much as digits as its factorization.

212113009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 212113009 is about 14564.1000065229. The cubic root of 212113009 is about 596.3791270131.

The spelling of 212113009 in words is "two hundred twelve million, one hundred thirteen thousand, nine".