213123323309 has 8 divisors (see below), whose sum is σ = 243018450360. Its totient is φ = 185156914176.

The previous prime is 213123323279. The next prime is 213123323333. The reversal of 213123323309 is 903323321312.

It can be written as a sum of positive squares in 4 ways, for example, as 8296477225 + 204826846084 = 91085^2 + 452578^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213123323309 - 2²⁰ = 213122274733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213123323009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482179244 + ... + 482179685.

It is an arithmetic number, because the mean of its divisors is an integer number (30377306295).

Almost surely, 2^213123323309 is an apocalyptic number.

It is an amenable number.

213123323309 is a deficient number, since it is larger than the sum of its proper divisors (29895127051).

213123323309 is a wasteful number, since it uses less digits than its factorization.

213123323309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964358959.

The product of its (nonzero) digits is 17496, while the sum is 32.

The spelling of 213123323309 in words is "two hundred thirteen billion, one hundred twenty-three million, three hundred twenty-three thousand, three hundred nine".