243123104213 has 12 divisors (see below), whose sum is σ = 267322538700. Its totient is φ = 220948178880.

The previous prime is 243123104209. The next prime is 243123104239. The reversal of 243123104213 is 312401321342.

It can be written as a sum of positive squares in 2 ways, for example, as 111250265764 + 131872838449 = 333542^2 + 363143^2 .

It is not a de Polignac number, because 243123104213 - 2² = 243123104209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243123104243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39431 + ... + 698427.

It is an arithmetic number, because the mean of its divisors is an integer number (22276878225).

Almost surely, 2^243123104213 is an apocalyptic number.

It is an amenable number.

243123104213 is a deficient number, since it is larger than the sum of its proper divisors (24199434487).

243123104213 is a wasteful number, since it uses less digits than its factorization.

243123104213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662068 (or 662057 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 243123104213 its reverse (312401321342), we get a palindrome (555524425555).

The spelling of 243123104213 in words is "two hundred forty-three billion, one hundred twenty-three million, one hundred four thousand, two hundred thirteen".