243121245293 has 16 divisors (see below), whose sum is σ = 252707111280. Its totient is φ = 233616531456.

The previous prime is 243121245287. The next prime is 243121245331. The reversal of 243121245293 is 392542121342.

It can be written as a sum of positive squares in 8 ways, for example, as 5174356489 + 237946888804 = 71933^2 + 487798^2 .

It is not a de Polignac number, because 243121245293 - 2⁴ = 243121245277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121245233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16053821 + ... + 16068957.

It is an arithmetic number, because the mean of its divisors is an integer number (15794194455).

Almost surely, 2^243121245293 is an apocalyptic number.

It is an amenable number.

243121245293 is a deficient number, since it is larger than the sum of its proper divisors (9585865987).

243121245293 is a wasteful number, since it uses less digits than its factorization.

243121245293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17776.

The product of its digits is 103680, while the sum is 38.

The spelling of 243121245293 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, two hundred ninety-three".