213013124309 has 4 divisors (see below), whose sum is σ = 217032239916. Its totient is φ = 208994008704.

The previous prime is 213013124297. The next prime is 213013124329. The reversal of 213013124309 is 903421310312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 194538334225 + 18474790084 = 441065^2 + 135922^2 .

It is a cyclic number.

It is not a de Polignac number, because 213013124309 - 2⁴ = 213013124293 is a prime.

It is a super-2 number, since 2×213013124309² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213013124329) 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 in 3 ways as a sum of consecutive naturals, for example, 2009557724 + ... + 2009557829.

It is an arithmetic number, because the mean of its divisors is an integer number (54258059979).

Almost surely, 2^213013124309 is an apocalyptic number.

It is an amenable number.

213013124309 is a deficient number, since it is larger than the sum of its proper divisors (4019115607).

213013124309 is an equidigital number, since it uses as much as digits as its factorization.

213013124309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4019115606.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 213013124309 in words is "two hundred thirteen billion, thirteen million, one hundred twenty-four thousand, three hundred nine".