2123213009 has 2 divisors, whose sum is σ = 2123213010. Its totient is φ = 2123213008.

The previous prime is 2123212991. The next prime is 2123213017. The reversal of 2123213009 is 9003123212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1874457025 + 248755984 = 43295^2 + 15772^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123213009 - 2²⁰ = 2122164433 is a prime.

It is not a weakly prime, because it can be changed into another prime (2123213509) 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, 1061606504 + 1061606505.

It is an arithmetic number, because the mean of its divisors is an integer number (1061606505).

Almost surely, 2^2123213009 is an apocalyptic number.

It is an amenable number.

2123213009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123213009 is an equidigital number, since it uses as much as digits as its factorization.

2123213009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 2123213009 is about 46078.3355710685. The cubic root of 2123213009 is about 1285.2803133167.

The spelling of 2123213009 in words is "two billion, one hundred twenty-three million, two hundred thirteen thousand, nine".