213243020009 has 2 divisors, whose sum is σ = 213243020010. Its totient is φ = 213243020008.

The previous prime is 213243019991. The next prime is 213243020033. The reversal of 213243020009 is 900020342312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170123251600 + 43119768409 = 412460^2 + 207653^2 .

It is a cyclic number.

It is not a de Polignac number, because 213243020009 - 2⁸ = 213243019753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213243020009.

It is not a weakly prime, because it can be changed into another prime (213243020059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106621510004 + 106621510005.

It is an arithmetic number, because the mean of its divisors is an integer number (106621510005).

Almost surely, 2^213243020009 is an apocalyptic number.

It is an amenable number.

213243020009 is a deficient number, since it is larger than the sum of its proper divisors (1).

213243020009 is an equidigital number, since it uses as much as digits as its factorization.

213243020009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The spelling of 213243020009 in words is "two hundred thirteen billion, two hundred forty-three million, twenty thousand, nine".